Corte-Clean® has been PROVEN for CLEANING COMPOSITES DECKS, DOCKS & FENCES for over a DECADE, especially when multiple OTHER PRODUCTS ultimately FAIL, as so many of our NEW CUSTOMERS have experienced. More importantly, it has been PROVEN to KEEP THEM CLEAN, generally at a MUCH LOWER COST.

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BEFORE CORTE*CLEAN® – Mold infested, Grease & Oil, Rust, Etc.

AFTER CORTE*CLEAN® – Same composite deck!

Why choose Corte*Clean® to clean an expensive composite deck, dock or fence?

CORTE*CLEAN® is the proven solution for cleaning all common staining issues caused by mold & mildew, black spots, sap, grease, oil, barbecue, tannin, leaf, pine needle, chalk, berries, blood, sunscreen, olive oil, citronella candle oil, peanut butter, red wine, pet food & waste, hard water, grass, ground in dirt, clay, brick, flower pot, rust, grime, green slime & most other stains that are deep set or below the surface & can deeply root into or saturate into the porous surfaces of most composites.


Corte*Clean® is designed to clean plastic & wood composites, especially those made from dirty recycled plastic, which have been found to grow molds from within, & dirty recycled wood fibers, to eliminate what is known as “tannin bleeding”, or the food from which funguses such as molds, mildews, lichens, mosses & algaes can feed. Corte*Clean® then soaks into the pours of most composites & continues to clean, any time it receives moisture, generally keeping composites clean for longer periods of time, until thoroughly rinsed. Routinely using Corte*Clean®, at least twice yearly, spring & fall, or when stains appear, as recommended by composite manufacturers, at the reduced “routine cleaning” Corte*Clean® strength, preferably before composites reveive moisture, fungus spores hatch & stains occur, or other stains saturate, is proven to generally cost up to 1/2 the Corte*Clean® or money, & up to 2/3rds less time & labor to apply, to keep composites clean. Good luck finding a proven, more cost effective, single product, that cleans all common stains from expensive composites, & keeps them clean, generally for less.



Corte*Clean® does not have all the additional costs, risks & time related to expensively purchasing & laboriously using multiple other perceived inexpensive cleaning products, to clean specific stains, as commonly recommended by composite manufacturers.  You won’t need to purchase & use one product for fungus stains, especially those products that claim to clean and/or prevent, but generally take months to work, if at all. A 2nd product to clean corrosion stains from rust, which corrosive cleaning products cause to structural metals & composites surrounding them, or tannins, from leaves, pine needles or other organic debris. A 3rd product for grease & oil or multiple other specialty products to clean specific stains & spotting. You won’t need to purchase & apply expensive products that claim to seal composites, or expensive strippers to remove sealers when they begin to generally rapidly weather off, crack & look ugly. The information on this web site should be carefully considered. It will help guide you to why Corte*Clean® is the single, safest, cost effective, eco responsible, biodegradable, non-corrosive to structural metal product for cleaning & keeping long lasting composite decks, docks, & fences clean without destroying your expensive investment or the metal structure supporting & holding it together.



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Please, make sure you review the entire Corte-Clean® websites!

This includes the Corte-Clean® Instructional Demo Video, which repeat the Corte-Clean® Label Directions to educate yourself regarding cleaning expensive composites & keeping them clean. Not only do we want to make sure you get the composites thoroughly clean, while resolving the underlying issues that can cause & feed molds, we want to make sure we teach you how to keep them clean, for as long as possible, at the lowest possible cost, with the least amount of time & labor or effort. No person wants to waste unnecessary time & money cleaning anything, especially expensive composites that were believed to be “NO MAINTENANCE”.

Cleaning composites & keeping them that way is different than maintaining wood decking. Generally black molds, are common on composites & white or sometimes gray colored, generally silky looking mildews, a mold subspecies, is common on fresh cut untreated improperly stored wet wood, such as pine or Douglas-fir & is commonly seen at a lumber yard. Mildews have been found to be extremely rare growing on composites, as when it dries out it generally turns from silky, to powdery & generally blows away with the wind. Mildew isn’t the dark black pesky mold leopard spots composite deck owners generally first experience rooting into their decking, which starts out about the size of a dime or a quarter. They often have no idea what it is?

Most deck cleaners were originally designed & intended to clean specifically “wood” of “mildew”, which is generally disguisedly defined as a “mold” on these products label directions. Those that have experienced green lichens & mosses, which are generally conveniently confused with red or green algae, which is not a fungus, because algae only grow in water, such as an untreated pool, are almost always a sign of extreme neglect, and/or improper care with scientifically unproven mold cleaning products. These products contain “sodium hypochlorite”, the active biocide in chlorine bleach and common deck washes, because this biocide is claimed to be effective for cleaning specific mildews & treating algae in water.


The chlorine bleach sodium hypochlorite industry has done a tremendous job of confusing most people that mold is mildew, mildew is mold & algae is lichen or moss, so they can sell you products that contain this biocide & you believe it is the right product to remediate your problems. Welcome to the chlorine bleach scam, which has caused so many problems for those that choose to ignore mold remediation science! Unfortunately, most retailers & composite manufacturers have naively fallen for, been sold or actively participated in the high margin, money making, guaranteed repeat sale scam.


Sodium hypochlorite-based deck cleaning products, that were designed to clean “wood” of “mildew” should never be used to clean wood & plastic composites of the common black molds species found growing in most composites, or green lichens & mosses. Unfortunately, unscrupulous chemical manufacturers have added “cleans composite decking”, in an attempt to sell more product & increase profits, knowing the product they manufacturer will generally exacerbate the types funguses most commonly found growing in composites. Scientifically, this will be explained.


Composites are generally made from recycled wood or other dead organic materials & plastic. Some composites are made with recycled plastics that commonly came from plastic bags, shrink wrap, milk jugs, discarded food containers, cheese wrappers’, etc. Recycled plastic commonly used was not generally thoroughly cleaned, so it was likely going to grow molds that were consuming rotting organic matter. Composite manufacturers generally believed heating the plastic before mixing it with wood & extruding into composites would sterilize it. Unfortunately, they didn’t generally clean the recycled wood fibers of tannins, from which funguses can feed. This generally resulted in molds growing from within composite boards & feeding from the tannins from the wood fibers & other organic matter when the composites receive moisture. This explains why some composite decks owners have experienced molds growing on only one composite board, and none surrounding it, until it generally spreads. With other composites generally made from recycled wood & virgin plastic, this is less common, but still can occur, as extruders generally do not get hot enough to kill mold spores or seeds, as the plastic & dry wood would catch fire first.


Sodium hypochlorite-based products that were originally designed to clean “wood” decks of “mildew” & “algae”, we’re not generally designed to clean recycled wood decks of tannins, to eliminate what is known as “tannin bleeding” in the composite decking industry, or the food from which funguses feed. This would remove the redwood, cedar, teak, mahogany, etc. tannins color or natural beauty from natural wood decks. Wood deck owners generally wish to restore these beautiful wood colors, not remove the tannin pigment. Once you have chlorine bleached the wood with sodium hypochlorite, chemical manufacturers then generally sell you a “wood brightener”, which contains “oxalic acid” to restore the color of the tannin pigments to its natural beauty, before selling you a stain or sealer to protect the deck from the elements. Therefore, using a product originally designed to clean “wood” of “mildew” & treat water for “algae” should not be used in an attempt to clean wood of tannins or dirty recycled plastics, as they generally do not resolve the underlying issues which feed molds from which most composites are made. However, they do generally temporarily bleach out the problem & exacerbate it, while causing other problems to otherwise much longer lasting composite decks. The previous use of these products generally results in the perfect environment for new mold spores (seeds) in the air, that land on composites surfaces & receive moisture to root & thrive! The bottom line is, you wouldn’t use diesel fuel to power a gas vehicle, unless you wanted expensive problems, so why in the world would you use a wood deck cleaner to clean a plastic and wood composite deck?

Composite cleaning issues, specifically those caused by rapidly returning molds generally due to negligent cleaning chemical recommendations, is a serious industry wide known problem, especially for composites located in humid or moist environments, or that receive routine moisture & are neglected, only power washed, or where scientifically unproven products have been routinely used until it no longer bleaches out the color of composites & molds. This generally results in funguses, rapidly returning, when the composites are steralized of everything, but the molds & the foods from which they feed, when they receive moisture, which so many composite owners unfortunately experience, which has tarnished the overall reputation of the composite decking industry.

Corte-Clean® still working to cleaning Trex®. Look carefully, you can still see Corte-Clean® turning dirty as it is cleaning.


Failure to review the Corte*Clean® websites, or at least watch the demo video & carefully read, comprehend & follow its label directions in English, Spanish or French, will likely result in you being dissatisfied with our proven product, as unfortunately some do.  Do not cut corners or get cheap if you choose Corte*Clean®! You likely already tried this by using multiple other preceived inexpensive cleaning products, wasting much time & money!  Please, DO NOT PURCHASE Corte*Clean® if you are not willing to thoroughly review the provided information & contact us if you have any questions, specifically if you are one of our potential new customers that chooses Corte*Clean®, after using multiple other cleaning chemicals, until they exacerbate molds & other cleaning problems. If this is you, you are likely dealing with a very serious problem!


The following information will alert composite owners to what is referred to as “The Chlorine Bleach Scam” in the composite decking industry!

Mold infested TimberTech® Composite Deck from years of routine sodium hypochlorite, till it had little if any chlorine bleaching effect with common black mold, resulting in the molds no longer spotting, but completely infesting, resulting in a worst case scenario!


There is good scientific reason why, the Occupational Safety & Health Administration, OSHA, (CLICK HERE), states {Under: “Use of Biocides”} “The use of a biocide, such as chlorine bleach, is not recommended as a routine practice during mold remediation”.  The active “biocide” in “chlorine bleach” is “sodium hypochlorite”, which has been commonly recommended, by all known composite manufacturers, generally, under “Care & Cleaning” for “Mold & Mildew”, be used on a routine “Spring and Fall” basis. They have done this even though a scientific study was conducted by Oregon State University (CLICK HERE) titled “Ability of bleach and other biocide treatments to remove and prevent mold…(2004, April)”, has proven the specific “biocide”, “sodium hypochlorite” to be ineffective in mold remediation, or cleaning & keeping clean of mold, from the “wood”, of which most composites are partially made, by concluding “Increasing bleach concentrations from 2.5 up to 20 percent [sodium hypochlorite] solution had no effect on the appearance of the wood following the wash treatment, nor did such treatments completely eliminate fungi from the wood surface. The chemical mold prevention treatments tested were not effective in sterilizing the wood, nor did they improve the visual appearance.”! This science is especially true with composite manufacturers that use recycled hardwoods, such as “oak”, “maple”, etc., as these species are notorious for supporting fungi in composites due to the structural cellulose being more dense with tannins that feed molds. Some composite manufacturers have even chosen to recommended products that contain “sodium hypochlorite” & polluting “phosphates”, which act like Miracle-Grow® for helping molds generally rapidly return, especially algae’s in water!  Composite manufacturers have chosen to ignore this irrefutable, indisputable, mold remediation science, almost always resulting in rapidly returning molds (mildew is a specific sub species of  mold), lichens, mosses (& algae if composites are generally submerged), when sodium hypochlorite are routinely used.

Mold spotted A.E.R.T.® ChoiceDek® made with oak hardwood.


Most composite deck owners trusted composite manufacturer cleaning chemical recommendations, for cleaning “mold and mildew” that contain “sodium hypochlorite”, because it generally appears to rapidly bleach out funguses & other stains, the first several times used. Unfortunately, this generally chlorine bleaches the color of almost all composites, especially those made from recycled plastics, which were generally colored after the plastic was made, beyond what most composite manufacturers disclosed under “weathering”, or bleaching/fading, especially when using these products undiluted, in direct sunlight and/or when using products that contain higher sodium hypochlorite strengths. This lead to the 2nd biggest complaint in the composite industry, excessive color fade by chlorine bleaching, which has lead to much contention between retailers, composite owners & manufacturers, both composite & chemical, that refuse to warrent the issue they have recommended & caused, especially those manufacturers that recommend using these products undiluted! When these products no longer appear to bleach molds from composites, most composite manufacturers then decided to recommend that owners rachet up the the sodium hypochlorite concentration, by generally recommending that products be used undiluted, ignoring these products label directions, even though OSHA states “When you use biocides as a disinfectant or a pesticide, or as a fungicide, you should use appropriate PPE, including respirators. Always, read and follow product label precautions. It is a violation of Federal (EPA) law to use a biocide in any manner inconsistent with its label direction.“! These “biocide” based products are generally 5%+ sodium hypochlorite, further exacerbating fungus problems, by making the molds more resistant to the chlorine bleaching effect, while further bleaching the color of the composites! When these products generally ultimately fail in bleaching the funguses or result in rapidly returning funguses, they then generally recommend specialty products, only available over the internet, with even greater sodium hypochlorite concentrations, one of which has a short 30 day shelf life!

Elk Cross Timbers® where the mold is no longer spotting but infesting the composite decking resulting from the routine use of sodium hypochlorite!


Routine use of any sodium hypochlorite based product, at any sodium hypochlorite strength, generally results in visible fungus stains never going away and/or rapidly returning when composites recieve moisture because, as OSHA states; “In most cases, it is not possible or desirable to sterilize an area, as a background level of mold spores comparable to the level in outside air will persist”. “Outside air” is where most composites decks, docks are located. Over time, the routine use of sodium hypochlorite generally results in the complete mold infestation of composites. This is likely the reason why you found Corte*Clean® & are reading this. This generally results in the molds no longer spotting but turning the entire composite boards black, with molds, especially when wet, with water, as water generally magnifies funguses rooting into composites and other stains. When left unbleached, then the green lichens or mosses generally rapidly grow, but sometimes they grow first!

Correct Deck® infested with molds, green lichens or mosses, previously only routinely cleaned sodium hypochlorite, installed with stainless steel deck screws, which do a good job of hiding underlying corrosion issues due to this metal generally turning a dulling blackish grey color  & unseen pitting as the corrosive cleaning chemical works its way down the screw!


Composite owners who use corrosive to metal sodium hypochlorite based cleaning chemicals generally notice red or black rust corrosion stains around metal deck screws & nails. These stains act like a WARNING LIGHT going off! Most choose to ignore???!!!

Trex® where sodium hypochlorite was recommended to be routinely used used “twice a year”, “Spring and Fall”, in their “Mold Technical Bullitin” until completely mold infested! Notice the black mold with a green tint from the lichen or moss & the red rust corrosion bleeding from the screws into the composites. What do you think the sodium hypochlorite has done to the non-visible galvanized and/or stainless-steel joist hangers & nails or screws under the decking?


There is good reason the structural metal decking hardware manufacturers have disclosed the “corrosion risks” of “cleaning chemicals” such as those that contain “sodium hypochlorite” (see your specific decking hardware manufacturer literature or call them & ask “is it OK to use corrosive cleaning chemicals, that will come into contact with structural metal”)! There is likely good scientific reason related to liability to why one of the most well known sodium hypochlorite based cleaning products, “CLOROX® OUTDOOR BLEACH CLEANER”, has disclosed “DO NOT USE THIS PRODUCT IN FULL STRENGTH”, “Always dilute strictly in accordance with label directions” for “galvanized” “materials”, “Strength” “Low (Green)” “Dilution” “1:21” “6oz (3/4 cups) of product to 122oz (15 ¼ cups)” of water!!! Most retailers, composite & chemical manufacturers have recommended & sold much higher sodium hypochlorite concentration based products, such as those products that contain 5% or above be generally used undiluted! These products still aren’t even close to the “20%” sodium hypochlorite strength which OSU has proven to be scientifically ineffective in mold remediation with wood, but will likely rapidly corrode structural metal decking hardware, especially when used at strengths above what CLOROX® recommends!

Trex® where sodium hypochlorite was routinely used until mold infested & visible screws are showing red corrosion. Notice how the area wet, with water, magnifies the molds. Commonly sodium hypochlorite bleached composites look clean when dry. Don’t be fooled! The mold will rapidly return with vengence when it receives moisture.


“Galvanized” “materials” are almost always used in the manufacturer of joist hangers & nails, to structurally support & hold together almost all composite decks, due to these items being generally recommended by composite deck manufacturers in “Installation Guides”. The rare exception is where more expensive stainless-steel joist hangers & fasteners have been used. Stainless-steel is commonly used to fasten composites to the structure under it. While stainless steel is more resistant to corrosive sodium hypochlorite-based products than galvanized metal, it is not immune to corrosion caused by it, especially when used at higher strengths, as it generally “pits”, resulting in the loss of structural value. Rapidly returning pesky mold stains are generally only an unhealthy unsightly nuisance that costs more time & money to properly thoroughly initally Corte*Clean®. Irreversible corrosion to structural metal, caused by the recommendation & those profiting from corrosive composite deck cleaning chemicals products, especially when recommended be used on a routine basis, generally leads to extremely laborious & expensive early replacement when corrosion is noticed. Do you think retailers, chemical & composite manufacturers are going to replace the irriversable damage they have caused by recommending and/or profiting from the sale & use of corrosive sodium hypochlorite based cleaning chemicals? You really should ask them before purchasing & using these products.

Corroded “pitted” stainless steel deck screw.

Corroded galvanized nails almost always used with joist hangers in deck construction, with green lichen or moss!

Corroded decking joist hanger & nails!!!

Corroded structural metal I-Beams under Composite decking as recommended & sold by at least one composite manufacturer who routinely recommends sodium hypochlorite for cleaning molds!


It is HIGHLY recommended that owners get their decks professionally inspected on a yearly routine basis, especially if they have noticed corrosion, galvanized and/or stainless steel have not been used, sodium hypochlorite or other corrosive cleaning chemicals have been routinely used, salts have been used to melt ice or it is located in a corrosive environment, such as near the ocean!


Failure to replace structural metal, when corrosion is noticed, can lead to structural failure, when generally under load from the increased weight of people! This is inexcusable, especially if people are injured or worse, especially when it could have been totally avoided.  This is currently the #1 Ticking Time Bomb in the decking industry, most retailers, chemical & composite manufacturers & owners continue to ignore!


So what have the retailers, composite & chemical manufacturers commonly recommend in an attempt to hide the corrosion the sodium hypochlorite recommended products caused?

Does “oxalic acid” based products, commonly known as “deck brighteners”, ring a bell?

The risks of using multiple other commonly composite manufacturer recommended cleaning chemicals, in conjunction with sodium hypochlorite, one after the other, to clean porous (soaks into) composites, that are at the opposite ends of the pH scale, can & generally do release toxic poisonous gas! Hopefully you havn’t experienced it, as we have, when testing Corte*Clean® alongside other cleaning products in the presence of a major publically traded composite manufacturer. The poison generally smells like burnt rubber, resulting in generally temporary loss of smell/taste & a terrible nausieating chemical headache, that can last for days! It can off-gas poisonous fumes from composites for hours or days. Breathing this toxic gas by anything living can lead to long term debilitating health issues, especially with the young, the elderly, or those that suffer from breathing conditions; such as asthma, bronchitis or emphysema. There is a potentially deadly serious reason why OSHA states  “Never mix chlorine bleach solution with other cleaning solutions or detergents that contain ammonia because this may produce highly toxic vapors and create a hazard to workers.” Yet, most started out trying to initially clean their porous composites, at the recommendation of some composite manufacturers, with “liquid dishwashing detergents” that contain “ammonia”, and state “DO NOT MIX WITH BLEACH” on these products label directions. When this fails, composite manufacturers commonly recommend a “sodium hypochlorite” based product, then “oxalic acid” when composite owners complain about the rust stains, which is the absolute worst use sequence possible, unless you are generally trying to poison your customers or composite manufacturer employees that have tested and/or used these chemicals inorder to recommend them! WARNING! DO NOT DO THIS!! POISONOUS TOXIC FUMES WILL VERY LIKELY RESULT!!! Read & follow any chemical products label directions, including Corte*Clean®!!! 


All known retailers & composite manufacturers have all been made well aware these facts, since approximately 2006, but continue to ignore the risks they recommend to their customers & employees who follow specific cleaning chemical recommendations. When we’ve asked, one manufacturer employee in charge of cleaning chemical recommendations, this employee straight out told us they are “interested in providing perceived, low cost products, that appears to instantly bleach away the problem, so the deck owner cleaning warranty claims goes away”, and that they “aren’t interested in solving the problem with mold, but making money”.  He then alluded to a financial kickback, should he decide to continue to recommend Corte*Clean®. This was not isolated to only one composite manufacturer. Corte LLC refuses to pay for composite manufacturers cleaning chemical recommendations of Corte*Clean®.

Corte Clean® working (left of photo) to clean mold stained Trex®

When we bring up the science, outrageous costs, time, labor & other risks or dangers of specifically the multiple cleaning chemicals composite manufacturers continue to recommend, some composite manufacturers have chosen to no longer recommend our proven product in retaliation, or specifically state to NOT USE Corte*Clean® in “Care & Cleaning” recommendations. A former CEO of one of the largest publicly traded composite manufacturers told us “his mother had been using chlorine bleach for decades to kill mold, so he was recommending it to his customers” even though he was shown the scientific facts??? The approach by all known composite manufacturers has been very similar to selling cigarettes, then denying they cause cancer, and all kinds of other problems, in the pursuit or profits over customer safety, while preying on the uneducated beliefs, especially as it relates to remediating molds with chlorine bleach or other sodium hypochlorite based biocides.

Corte Clean Cleaning Mold From ChoiceDekLowe’s® A.E.R.T.®ChoiceDek® where sodium hypochlorite was routinely recommended & used until completely mold infested & Corte Clean® working. Swan® stainless steel screws were used to attached the composite boards to the underneath joists, which were structurally heald together with galvanized nails & Simpson Strong-Ties®.

They do this even though a far safer, single, cost effective, non-corrosive to structural metal, more environmentally responsible, biodegradable, proven product, for cleaning all common stains, not just those caused by molds, & keeping composites clean, generally at a much lower cost, has existed for over a decade? Could it be the routine financial kickbacks, for recommending multiple, perceived inexpensive, but ultimately more profitable cleaning chemicals, especially those that are sodium hypochlorite based & scientifically un-proven for mold, generally resulting in its rapid return, and the need to rapidly re-purchase/ re-use, while irreversibly corroding out structural metal, generally requiring the early expensive replacement, before otherwise long lasting composite decking is fatigued, but is generally always replaced with the decking structure, leading to new composite decking being purchased sooner, & increased profits, outweighs customer safety & overall satisfaction with the composite decking industry & reputation? That’s for you to decide.

Mold, Lichen & Moss Infested Composite Deck (left) & Corte Cleaned® (right). This composite deck was installed with hidden fasteners, which became a trend with most composite manufacturers. Was it an attempt to hide corrosion caused by the recommendation of corrosive cleaning chemicals? While that may seem like a stretch to most, it shouldn’t if you take the time to do your own dudiligance to specific cleaning chemical recommendations with your specific composite manufacturer.


Corte, LLC provides a GUARANTEE & LIMITED WARRANTY along with quality customer service, by people whom have actually cleaned numerous composites with Corte*Clean® & just about everything else before discovering Corte*Clean® for major composite distributors & manufacturers! Corte*Clean® was originally developed by a chemical manufacturer owner & chemical engineer, which was established in 1960, to clean his personal Trex® deck, then tested by composite distributors & manufacturers’ until perfected, at which time Corte LLC was founded in 2006 to bring the proven product to market. Corte LLC wants every customer to be satisfied with the results of Corte*Clean®, so they can spend more time enjoying their clean composites, & less time & money cleaning them & keeping them clean. If you have any questions before one purchases/uses or after Corte*Cleaning®, especially if the desired results are not reached, before posting a negative review, please have the common decency to Contact US!

2017 Trex® Transcend® PVC “CAPPED” decking with recycled wood & plastic core, which has been Corte-Cleaned® (ABOVE) Testimonial 4.7.2018


I have a trex deck in a new construction home with 2 dogs. The grass just got installed last year along with the deck. This year the deck was so muddy and dirty I thought it would never look like it did last year. I followed the instructions exactly as it was stated and the deck looks brand new. I cannot believe the difference. I did have to rinse it very well to get all of the white residue off. I wish I took a before picture. The results are amazing. I will continue to use the product year after year.
N. Schmidt, OH. Verified on Reviews.IO

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