[Home page Welcome to Corte-Clean® - Composite Deck, Dock and Fence Cleaner - effectively cleans composites of all common stains caused by Mold, Mildew, Black Spots, Grease, Oil, Barbecue (BBQ), Tannin Stained Wood Fibers (usually black), Leaf, Rust, Chalk, Algae, Berries, Red Wine, Hard Water, Grass, Spots, Ground In Dirt, Grime, Slime and any other composite stains that have soaked into a composite’s surface.]