Corte clean did a fantastic job cleaning my deck. Although I still had a few residual stains after cleaning, they were much lighter than they had been and overall the results were better than I had ever achieved in the past 15 years of owning the deck. My primary concern was black mildew stains that were almost completely eliminated. The mildew staining under my grill mat was so improved that I got rid of the mat. Grease stains were reduced but required other cleaners to get to my satisfaction. I wouldn't give Corte clean five stars for its cleaning ability and the great customer support I received. The reason I gave the product for stars was because there are a couple matters you need to keep in mind when using Corte clean. Corte clean insists that you follow the instructions carefully. This means af fair bit of prep work and also that you apply the product during the appropriate weather conditions. In my area, which is Maryland, having the necessary warm weather without rain, so it can be a challenge. so it's a waiting igame to be able to clean the deck. Also, application of the product is not as simple as spray and wash it off. It requires care where you put it down, protecting plants around the deck, and scrubbing the deck well while it's still wet. It will take time but the results will be worth it.
Posted 6 months ago
Thanks for the review! Once thoroughly Corte Cleaned, you likely have weathering issues caused by stains blocking the sun from evenly bleaching or fading your composite decking. Only the sun can weather these issues out, as Corte Clean isn't designed to bleach/fade beyond what occurs naturally by exposure to the sun, like other products. Color variations caused by items & stains blocking the sun is extremely common on a 15 year old composite deck where Corte Clean hasn't been used before. If the "black" mold "stains" (mildew looks silky white till it drys out and looks powdery white, therefore this likely isn't the problem staining your composites) & grease/oil stains weren't completely eliminated, you didn't completely Corte Clean your composite deck and must "repeat" the Corte Clean application process as stated on its label directions. Corte Clean is a cleaning chemical product and you MUST follow its label directions, or it will likely fail, especially when cleaning a 15 year old composite deck where other products have been previously used that can exacerbate cleaning problems, especially if they contain sodium hypochlorite. If your deck is a 15 year old mess, the "prep work" is incredibly important! You should be able to get it 85% to 95% clean with a brush & water alone, then let it "thoroughly dry", for several days to a week or more so the black mold stains can "thoroughly dry" (so they no longer look like a black oil drip). It is extremely important to have the "necessary warm weather" of 65F to 85F to allow composites to expand, the pours to open, grease & oil to solidify, so Corte Clean can clean those stains that are deep set or below the surface while cleaning the wood & recycled plastic from which most composites are made that can feed fungi. Corte Clean definitely "works best in direct sunlight" , especially to initially clean a "15 year" old composite deck that likely has exacerbated mold & grease/oil/etc. stains, which were likely exacerbated from the previous use of other products. One must "protect areas & items not intended to be cleaned." It is always a good idea to additionally protect any plants, shrubs and "Water plants before & after use." It sounds like you skipped the Corte Clean label direction where it states "Water magnifies stains. If stains are still visible, repeat application process. Composites that have tough stains, been neglected or previously cleaned other products and/or sealed may require several applications & additional Corte Clean" by using other products. Hopefully you did not skip the final Corte Clean label direction which states "When Corte Clean no longer becomes dirty or discolored, it can be diluted & allowed to dry on weathered composite surfaces. Corte Clean is designed to continue to clean any time it receives moisture. A white residue may remain until thoroughly rinsed (use a brush if necessary). Thoroughly rinse composite prior to using." The best way to thoroughly rinse is to allow the natural moisture from rain or snow to do the job. Had you done this, you'd have likely noticed any stubborn stains going away as your composites received moisture & the Corte Clean is allowed to continue to work. Moving forward, we'd suggest using Corte Clean at the reduced "routine cleaning" strength "at least twice yearly, spring & fall, or when stains appear, should you wish to generally spend less time labor & money keeping your composite deck thoroughly clean while preventing new stains. Initially, for the next year or two, we would suggest using Corte Clean more proactively to make sure your composites are thoroughly clean. Example" Winter, Spring, Summer & Fall. Get in-front of cleaning issues! Proactively using Corte Clean is the key. Had Corte Clean been proactively used, as it was designed & intended, for the past 15 years, you likely wouldn't have had these problems. Please call if you wish to thoroughly discuss.
Posted 6 months ago
Corte Clean Composite Deck Cleaner is rated 4.80 based on 540 reviews

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