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DEFY Composite Deck Cleaner is a safe, oxygen bleach deck cleaner that effectively removes black stains caused by algae, dirt, grime, and weathered graying from composite wood surfaces. Unlike chlorine bleach, this environmentally friendly deck cleaner is biodegradable and will not harm composite wood fibers, pets, grass, or most plants. Using a chlorine bleach not only harms the wood as well as the vegetation surrounding the deck, but it doesn’t actually clean or remove any stains. It just bleaches them out. DEFY Composite Deck Cleaner is a safe, powdered concentrate that is mixed with water to safely clean and restore the natural beauty of exterior, composite wood decks.