Composite Deck Cleaner

Since 2006!

Corte*Clean® is how to clean stains caused by mold & mildew, black spots, green slime, 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, & most other stains that can deeply root or saturate into the porous surfaces of composites that are generally made from exposed wood fiber & plastic.


Sodium Hypochlorite

causes the




Corte*Clean® is the original proven cost effective non-corrosive to structural metal decking hardware 100% biodegradable eco responsible proprietary formula FOR CLEANING ALL COMMON STAINS; with an emphasis on those caused by molds. Corte*Clean® has been a “Care & Cleaning Guide” and/or “Mold Technical Bulletin” composite manufacturer recommended cleaning product. Corte*Clean® does not contain sodium hypochlorite, which is scientifically known to exacerbate mold problems, corrode structural metal decking hardware & excessively chlorine bleach composites color beyond what composite manufacturers disclose under “weathering” in their literature; the 2nd biggest complaint/warranty claim in the composite decking industry behind rapidly returning mold stains, which is commonly caused by the previous use of sodium hypochlorite. Corte*Clean® does not have the additional cost, labor or risks of using multiple non-compatible corrosive to structural metal decking hardware cleaning chemicals like those that contain sodium hypochlorite or oxalic acid while voiding these products warranties, early replacement or structural failure! It doesn’t contain ammonia like liquid dish-washing detergents which additionally can off-gas toxic fumes when dangerously used in conjunction with other cleaning chemicals, specifically sodium hypochlorite, to clean porous composites. Problematic composites are most commonly made partially from virgin or recycled polyethylene (PE) plastic & exposed wood. These 1st generation composites were generally produced & installed from the 1990’s through approximately 2015 +/- depending on the manufacturer. Examples of these infamous composites known for mold are Trex Accents®, Trex Origins®, Trex Contours®, Trex Profiles®, Trex Brasilia®, TimberTech ReliaBoard® & DockSider® Lowe’s® ChoiceDek®, MoistureShield®, Home Depot® Veranda®, Fiberon®, etc. These composites aren’t capped with an outer layer of Poly “Vinyl” Chloride (PVC) plastic, therefor, sodium hypochlorite based products, such as Olympic® Deck Cleaner, and other deck cleaning products  which label directions state only “vinyl” plastic shouldn’t be recommended or used unless one wishes to ignore this & other cleaning products label directions, especially those that contain the biocide sodium hypochlorite; regardless of who recommends or sells them.


Before & After Customer Pictures. 



Corte-Clean® was designed to be used from the time composites are new, throughout their life-cycle, which is generally the length of their warranty. Failure to properly thoroughly clean composites made from exposed wood fibers of what is known as “tannin bleeding”, & especially those additionally made from dirty recycled plastic (milk jugs, shrink wrap, cheese wrappers, etc.), of this & other dead organic dirty matter that lands on composites from which molds, mildews, lichens, mosses & algae can feed has resulted in them being infamously notorious for fungi growth, & rapid re-growth, especially if THE CHLORINE BLEACH SCAM or common scandalous sodium hypochlorite based deck cleaners have been previously used.  Once composites are thoroughly Corte-Cleaned® of their inherent flaw(s) and/or the numerous problems caused by the previous use of other cleaners, proactively routinely using Corte-Clean®, at the reduced “routine cleaning” strength, to remove new stains & stain causing derbies before they cause new stains or the stains become deeply saturated or rooted is HIGHLY RECOMMENDED!  This is why most, if not all, composite manufacturers recommend & Corte-Clean® was designed for semi-annual cleaning, “at least twice yearly, spring & fall, or when stains appear”. Generally, the more routinely Corte-Clean® is initially applied (example: Spring, Summer, Fall, Winter), less & less is applied at a lower strength, the more time, labor & money is generally ultimately saved.

BEFORE – 18 Year Old Never Been Cleaned Wood & Plastic Composite Deck With Common Grease, Oil, Rust, Tannin, BBQ & Black Mold Stains.

AFTER – Same Composite Deck Cleaned Back to original Color from Customer Verified Testimonial on Reviews.IO

 Those that procrastinate or have previously used chlorine bleach or other sodium hypochlorite based products in an attempt to routinely clean molds or other fungi, have excessively bleach the color of composites while potentially dangerously corroding structural metal decking hardware resulting in rust stains; generally spend more to initially Corte-Clean® & need to initially Corte-Clean® more often to thoroughly clean deep stains in porous composites because of the need to repeat the application process. Unfortunately, it’s likely going to generally initially cost more time, labor & money to thoroughly Corte-Clean® due to the need to “repeat” the application process while using Corte-Clean® at higher strengths to thoroughly clean stains, tannin’s & dirty recycled plastic while restoring the weathered original color of composites. If you are going to be cheap with your expensive composite deck, & not buy enough Corte-Clean® to complete the job, or not follow its label directions, please do not buy our proven product, as you likely won’t be a happy customer. If you’ve read this far, you likely know you are dealing with a serious industry wide generally self inflicted known problem which has likely been previously exacerbated by what is known in the decking & mold remediation industry as “THE CHLORINE BLEACH SCAM” among professionals! Unfortunately, composite manufacturers have been complicit in promoting this scam to their customers while often recommending products be used against their label directions, many of which weren’t designed or labeled to clean composites at all. If Corte-Clean® won’t get your composites clean & help them stay clean for generally longer, at generally ultimately a lower cost, it’s likely nothing will. Save yourself time, labor & money, choose & routinely use Corte-Clean®, preferably before composites receive moisture, mold spores (seeds) hatch, deeply root or saturate; or when stains are first noticed.





Corte-Clean® does not have all the additional costs, risks & time related to expensively purchasing & laboriously applying multiple perceived in-expensive non-compatible chemical products to clean specific stains.


You won’t need to purchase & use one or more products for cleaning mold stains, especially those that contain sodium hypochlorite, the active biocide in chlorine bleach, which reputable mold remediation professionals & organizations, such as the EPA & OSHA DO NOT RECOMMEND for MOLD.


A 2nd product such as oxalic acid, known as a “wood brightener” which isn’t known to resolve “tannin bleeding”, can be additionally corrosive to screws, nails & joist hangers, requiring expensive early replacement, known to void these products warranties & can produce highly toxic poisonous gas if used in conjunction with sodium hypochlorite.


A 3rd product for grease & oil, most commonly from the barbecue (BBQ), which are generally not compatible with sodium hypochlorite or other chemicals because these products generally contain ammonia & can release toxic poisonous gas as disclosed by OSHA!


You won’t need to purchase & apply a 4th expensive laborious product to seal composites, which can exacerbate cleaning issues by sealing in fungi & stains, or 5th product to remove the sealer when they begin to generally rapidly weather off/crack & look ugly, especially when fungi grows underneath!


Corte-Clean® has been proven to restore some of the original color of some composites previously chlorine bleached with sodium hypochlorite based products, especially those products for mold, which are recommended & used against these biocides label directions, to routinely clean polyethylene (PE) plastic even though their label directions state they are intended to be used only on “vinyl” (PVC) plastics resulting in infamously excessively bleaching/fading or what composite manufacturers disclose under weathering, the 2nd biggest complaint in the composite decking industry, right after mold.


In addition to cleaning problimatic polyethelene (PE) based plastic composites, Corte-Clean® has been successfully used since 2006 to routinely clean & keep composites clean made from polypropylene (PP), such as Correct Deck® & poly vinyl chloride (PVC) plastics such as; Certainteed® Boardwalk, Ameri-Deck®, Procell® (now AZEK® which acquired TimberTech®), VEKAdeck® & more generally at a greatly reduced strength.*

(See verified testimonials on!)


Above is a picture of the newer generation PVC “CAPPED& PE / WOOD core composite decking that appears to have grown black mold in-between. This is becoming an increasingly common problem in the composite decking industry. Corte*Clean® likely won’t clean this issue because it can’t penetrate the non-porous PVC outer layer shell, except on the end cuts & where the screw holes are located; as pictured. Unfortunately, this is likely where moisture is initially entering the core, allowing the mold to grow in the first place.


The information on this web site should be carefully considered. It will help guide you to why Corte-Clean® is the single cost-effective proven solution for cleaning & routinely keeping generally longer lasting expensive composite decks, docks, & fences clean of all common stains; not just those caused by molds.


Corte-Clean® customers can SAVE up to $2,000 +/- every 300 Sq. Ft.

over 30 years, the expected life-cycle of most composites, however most will last double that?!**

**See 2 of the largest composite manufacturer cleaning chemical recommendation price comparisons (CLICK HERE)!


Corte*Clean® Instructional Video

(Click Here)

Buy Corte-Clean Composite Deck Cleaner



*Note: Brand names are trademarks of their respected owners.


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