Corte-Clean® has been PROVEN for CLEANING COMPOSITES DECKS, DOCKS & FENCES for over a DECADE, especially when multiple OTHER PRODUCTS 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 as picture to the left!

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

CORTE*CLEAN® is the proven solution for cleaning & generally inexpensively maintaining composites clean appearance of all common staining issues including mold & mildew stains, 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 saturate the porous surfaces of most composites, most notably when other cleaners fail.


Corte*Clean® is designed to clean plastic & wood composites, especially those made from 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 & algae 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, once the underlying issues with most composites has been thoroughly Corte Cleaned.  Corte*Clean® is then designed to be proactively used, before composites reveive moisture, stains occur or deeply saturate, to keep composites clean, which generally costs much less time, labor & money or Corte*Clean®.



Corte*Clean® does not have all the additional costs, risks & time related to expensively purchasing & laboriously using multiple other perceived inexpensive cleaning chemicals, to clean specific stains.  You won’t need to purchase & use one product for mold & mildew, green lichen & moss or algae, a 2nd product to clean corrosion stains from rust, which sodium hypochlorite based cleaning chemicals generally cause to structural metals & composites surrounding them, or tannin stains from leaves, pine needles or other organic debris, a 3rd product for grease & oil, & other specialty products to clean specific stains or spotting. You won’t need to purchase expensive products that claim to seal or strippers to remove these products when they begin to look ugly & weather off or other products that claim to clean and/or prevent only funguses, but generally take months work, if at all. The information on this web site should be carefully considered. It will help guide you to why Corte*Clean® is the single, safest, lowest cost, eco responsible, biodegradable, non-corrosive to structural metal product, that cleans all common stains, especially those that are deep set or below the surface, when used to clean & routinely maintain expensive, long lasting composites on a routine “Spring and Fall” basis, as most composite manufacturers have recommended the products they manufacturer be cleaned.



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Please, make sure you review this entire website.

Be sure to view the Corte*Clean® websites, instructional demo video & product 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 & effort. No person wants to waste unnecessary time & money cleaning anything, especially composites that were believed to be “NO MAINTENANCE”.

Cleaning composites & keeping them that way is different than maintaining wood decking, especially those that are “treated” to prevent rot and/or fungal decay, such as black mold (common on composites) & white or sometimes gray colored silky looking mildew stains (common on fresh cut wood, but extremely rare on composites). Those that experience green lichen & moss stains, which are generally conveniently confused with algae, by the sodium hypochlorite industry, because algae generally only grows in water, such as an untreated pool, are almost always a sign of extreme neglect or improper care with the wrong cleaning chemicals, and/or where the underlying issues with recycled plastic and/or wood has not been resolved. Composite cleaning issues, specifically those caused by rapidly returning molds, 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, such as molds, lichens or mosses, rapidly returning, which so many composite owners unfortunately experience, when using sodium hypochlorite based products, tarnishing the overall composite decking industry. We do not want this to happen to you or have any dissatisfied Corte*Clean® customers. Failure to review the Corte*Clean® websites, or at least watch the demo video and carefully read, comprehend & follow its label directions, will likely result in you being dissatisfied with our proven product. 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 the many customers that chooses Corte*Clean®, after using  multiple other other perceived inexpensive cleaning chemicals, until they exacerbate cleaning problems, no longer bleach out the stains or one notices rapidly returning fungus stains, especially those caused by common black molds, green lichens or mosses.

Mold infested TimberTech® Composite Deck from years of routine sodium hypochlorite, till it had little if any, bleaching effect.


The following information will alert composite owners to what is referred to as “The Chlorine Bleach Scam” in the composite decking industry. 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 and keeping clean of mold, from the “wood”, of which most composites are partially made by stating “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.”! 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 chose to ignore this irrefutable, indisputable, mold remediation science, almost always resulting in rapidly returning molds, lichens, mosses (& algae if generally submerged). Then, there are the composite manufacturers that will tell their customers “they use hardwoods”, such as “oak” or “maple”, even though these, & other hardwoods, are notorious for supporting fungi because they are more dense with tannins.

Mold infested 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 appeared to rapidly bleach out funguses, and other stains, the first several times used. Unfortunately, this generally chlorine bleaches the color of almost all composites, especially those made from recycled plastics, beyond what most composite manufacturers disclosed under “weathering”, especially when used in direct sunlight, and/or at higher undeluted sodium hypochlorite strengths, the first several times used. This lead to the 2nd biggest complaint the composite industry, excessive color fade by chlorine bleaching, which has lead to much contention between composite owners & manufacturers that refuse to warrent the issue they have recommended & caused. When these products no longer appear to bleach molds from composites, composite manufacturers decided to recommend that owners rachet up the the sodium hypochlorite concentration, by generally recommending  5%+ sodium hypochlorite based products be used, generally  undiluted, further exacerbating fungus problems, by making the molds more resistant to the chlorine in these products! When these products 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, which further bleached the color of the funguses, and the composites, while making the molds even more resistant to the chlorine in these products, further exacerbating the problem.


Routine use of any sodium hypochlorite based product, at any sodium hypochlorite strength, generally results in fungus rapidly returning & completely infesting composites. This generally results in the molds no longer spotting but turning the entire composite boards black, especially when wet, with water, as water generally magnifies funguses rooting into composites, likely why you found Corte*Clean® & are reading this. When left unbleached, then the green lichens or mosses generally rapidly grow!

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 cleaning chemicals generally notice red or black rust corrosion stains from uncoated or coated metal deck screws. These stains act like a WARNING LIGHT going off in a vehicle! Most choose to ignore???!!!

Trex® where sodium hypochlorite was used “Spring and Fall” until completely mold infested! Notice the black mold with a green tint from the lichen or moss & the red 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 and ask “is it OK to use corrosive cleaning chemicals, that will come into contact with structural metal”)! There is likely good scientific reason one of the most well known sodium hypochlorite manufacturer 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 composite & chemical manufacturers have recommended much higher sodium hypochlorite concentrations , such as those that contain 5% or above be generally used undiluted, which still isn’t even close to the 20% which has been scientifically proven ineffective in mold remediation, but would likely rapidly corrode structural metal decking hardware!

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 specific joist hangers, screws & nails, to structurally support almost all composite decks, due to these items being generally recommended by composite deck manufacturers in “Installation Guides” for use under composite decks. The rare exception is where expensive stainless-steel joist hangers & fasteners have been used under the deck. Stainless-steel is commonly used to fasten the composites to the structure under it. Stainless steel is more resistant to sodium hypochlorite-based products, but not immune to corrosion caused by their use as it “pitts”. Rapidly returning pesky mold stains are generally only an unhealthy unsightly nuisance that costs more time & money to properly thoroughly Corte*Clean®. Irreversible corrosion to structural metal, caused by corrosive cleaning chemicals, especially when recommended be used on a routine basis, generally leads to extremely laborious & expensive early replacement. 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.  This is currently the #1 Ticking Time Bomb in the industry, which unfortunately, most will continue to ignore!

Corroded “pitted” stainless steel deck screw.

Corroded galvanized nails 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!


So what have the composite & chemical manufacturers commonly recommend in an attempt to hide the corrosion the sodium hypochlorite recommended products caused? Does “oxalic acid” based products 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! It generally smells like burnt rubber, resulting in temporary loss of smell/taste and a terrible chemical headache. It can off-gas poison for hours or days & can lead to long term debilitating breathing issues, especially with the young, the elderly, or especially those that suffer from breathing conditions such as 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 composites with liquid dishwashing detergents that contain ammonia, and state “DO NOT MIX WITH BLEACH” on these products label directions, at the recommendation of composite manufacturers. When this fails, composite manufacturers commonly recommend a sodium hypochlorite based product, then oxalic acid, which is the absolute worst use sequence possible! WARNING! DO NOT DO THIS!! POISONOUS TOXIC FUMES WILL very likely RESULT!!! Read and follow any chemical products label directions, including Corte*Clean®!!! 


All known Composite manufacturers have all been made well aware these facts, for over a decade, but continue to ignore the risks they recommend to their customers. When we’ve asked, one manufacturer employee in charge of cleaning chemical recommendations, he 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 shady composite manufacturer. Corte LLC refuses to pay for composite manufacturers for 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 and 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” and that he “refused to believe OSHA or science from a major university”??? 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 “KILLING 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, and 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 scientifically un-proven for mold, resulting in the rapid return of molds, and re-purchase/rapid re-use, while irreversibly corroding out structural metal, generally requiring the early expensive replacement, before the composite decking is fatigued, but is generally always replaced with the decking structure, leading to new composite decking being purchased sooner, and increased profits, outweighs customer safety and overall satisfaction with the composite decking industry and reputation?

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® and just about everything else before discovering Corte*Clean® for major composite distributors & manufacturers!  Corte LLC wants every customer to be satisfied with the results of Corte*Clean®,  so they can spend more time enjoying their clean composites and 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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