I have tried a handful of different deck cleaners over the years to clean my composite decking. None of the cleaners have worked nearly as well as Corte Clean. I have even skipped a year in between cleans and Corte Clean still is able to clean my deck to the point it is almost spotless. It literally looks brand new after a good cleaning. My deck gets pretty dirty since I have woods in my backyard therefore I have to really scrub the deck with a scrub brush to get it very clean but it is well worth it to see the before and after results. In my experience Corte Clean does the best job of cleaning my deck compared to the three other brands I have tried over the years. I now buy directly from them as opposed to Lowes which used to carry this Corte Clean.