Having a deck in “mold heavy” area this is the only product that works. Tried Mold Armour, bleach, damp-rid…these items did not work! CORTE CLEAN is easy and effective to use. For tough areas just sprinkle the cleaner on a wet deck and scrub. A great product! Top of the line customer service. Buy this product do not waste your money or time on other products! ED B.