Wet & Forget Moss, Mold & Mildew Stain Remover, 1/2 Gallon, EPA Registered, Non-Caustic, Non-Acidic & Contains No Bleach, Just Spray & Walk Away, 1 Step Process, Safe & Gentle On Any Outdoor Surface, Use On All Roofing Surfaces, Concrete, Stucco, Painted Surfaces, Vinyl, Aluminum, Treated Lumber, & Manufactured Lumber, Brick, Stone, Aggregate & More, Coverage 375 To 1,125 SQ FT.