Wolman, Gallon, Deck & Fence Brightener, Liquid Concentrate Brightener For All Exterior Wood Types Including Redwood & Cedar, 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, Makes 5 Gallons Of Cleaning Solution, Replaces #1610-6 Redwood & Cedar Brightener.