RockSolid,, Gallon, Concentrate Deck and Patio Cleaner and Brightener, Ideal For All Wood, Including Cedar, Redwood, Composite and More, Covers Up To 2500 SQ/FT/Gallon, Fast Acting, Restores Wood To Its Bright, Natural Beauty, Removes Dirt, Mildew, Algae and Fungus, Can Be Used On Concrete As Well.