Bayer Advanced 704710 2-in-1 Moss and Algae Killer Ready-To-Spray, 32-Ounce Bayer 2-in-1 Moss and Algae Killer Ready-to-Spray 32oz Kills moss, algae and lichen where it grows Acts like two products in one - treats lawns and patios plus roofs and buildings Kills within hours, protects for months Kills moss and algae on lawns, decks, patios, fences, mulch, driveways, gravel, roofs and buildings. Unique, high efficiency formula kills within hours. No odor, no staining formula. Use on lawns, decks, patios, fences, mulch, driveways, gravel, roofs and buildings. Protects for months