The one think you have to realize when you are cleaning your composite deck is that there is no one try cleaner that works….none. When I first used this product yesterday on a large grease stain I applied it once, twice and didn’t get any result I started looking around for another product to try. I’m a contract that builds homes and does a lot of decks. I called my supply rep for one of the major decking products I use and asked him if he new of any product that would cure my problem. His response…there is none. So out of frustration I tried a third time with Corte-Clean using a bristle brush to scrub it in. After the third time I started to notice the grain in the deck. About 45 mins later and after the seventh try the stain was completely gone. Deck was like new. I had stains around my grille on the deck and got the same results. Did the rest of my deck and dock and the finishing result was nothing but amazing. As a contractor there is nothing more satisfying then buy a tool or a product and have it do the job it claimed it could do. This product did exactly that. The one thing I strongly recommend is that you don’t give up after the first application. It may take you more or less then the number of applications I used, but it does work. Let me add, I have nothing to do with this company. Don’t know the owner, any employees and other then buying their product I have no relationship with them at all. I just feel the frustrations of all those who were in my situation with no place to turn. If you have any questions or need reassurance feel free to reach me at belcobuilders.net. I’m John.