We own a home in Gardiner NY where we live from May to October.Every year, when we would come up here, the first thing I would do was to treat my composite Correct Deck with Outdoor Chlorox to get rid of the mold spots all over the deck. It worked but only for a short time and I would have to do it all over again monthly. In Sept. of 09 I decided to look for a better solution and found Corte Clean which I then applied to my Correct Deck. When I came back up in the beginning of May of 10 I was amazed to find my deck spotless. How nice to find a product that works exactly as advertised and made in USA to boot. Alex from Gardiner NY