Wolman, LB, Pouch Deck & Fence Brightener, Powder Concentrate, Mix With Water, Oxygen Bleach Based Formula Cleans All Types Of Exterior Wood Including Cedar & Redwood, Restores The Bright, Clean, Natural Look By Removing Weathered Gray Surface Fibers, Ground In Dirt & Stains From Mildew, Algae & Tannin Bleed, Enables Protective Finishes & Stains To Adhere & Penetrate, Chorine & Acid Free, 100% Biodegradable, Safe To Handle, Harmless To Plants, Won't Degrade Wood Fibers Or Leave A Bleached Out Look, Makes 2-1/2 Gallons Of Cleaning Solution, Approximately Enough To Do The Average Sized Deck.