Hop over to Walmart and get a deal on Miracle Brands 2x Concentrate Algae, Mold, Mildew Outdoor Cleaner, 1-Gallon. It cleans stains from Algae, Mold, and Mildew from anything outdoors. Miracle Brands Outdoor Cleaner can be used on a variety of surfaces, wood and composite decks, siding, patios, driveways, concrete, roofs and so much more. … Continue reading Miracle Brands 2x Concentrate Algae, Mold, Mildew Outdoor Cleaner, 1-Gallon $3.63 (Reg. $11.97)