I have a TimberTech deck in PA facing west. It is installed perfectly, facing west, so it took about 6 years for it to get mold. I tried other products and scrubbed my ass off. They never really worked and the mold rapidly returned. I then discovered Corte Clean at Lowe’s. This product works like stated. I have been using it for years and now buy it direct, from its website, and just again purchased. It sure is nice to get what you pay for and the deck stays clean for longer. I wish my buddy who had been using Corte Clean would have told me about it, instead of waiting for me to discover it!