Karcher, 12 Pack, Deck & Patio Wash Gel Pac Cleaner, Makes 3 Gallons Of Cleaner, 100% Biodegradable, Formulated To Remove Dirt, Grime, Mold & Mildew From Most Plastic & Wood Decks, Patios & Other Outdoor Surfaces Such As Stone, Wood, Concrete & Brick, Also Works On Wooden Fences & Playground Equipment, Not Harmful To Animals Or Plants.