Use Wolman deck and fence brightener wood cleaner and coating prep (liquid concentrate) to clean and restore decks and other weathered exterior wood, or to prepare new wood surfaces before sealing or staining. A universal cleaner for all wood types, it is also formulated to remove stubborn black tannin stains from new cedar, redwood, and exotic hardwoods. Product features: Chlorine-free, 100% biodegradable, will not harm plant life, damage wood lignin or leave a bleached-out look. Restores UV-grayed, dirty, mildew-stained wood surface to a bright, like-new appearance. Fast and easy-to-use, mix with water in less than 1 minute, does the job in 10 minutes. 1 gallon makes 5 gallon of solution; covers 750 sq. ft.