Gallon, 30 Seconds Outdoor Cleaner, Cleans Slimy Green & Slippery Black Algae, Moss, Mold & Mildew, Use On Wood, Paint, Concrete, Masonry, Painted Metal, Cloth & Plastic, Non-Corrosive, Non-Staining, Safe For Plants, Spray On & Hose Off, No Pressure Washer Needed, Deep Cleans With Instant Results.