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