Use to get rid of the moss build-up growing on patios, cement walkways, brick, and on steps and decks. All natural ingredients kill moss fast to restore the beauty of these outdoor areas and keep walkways from becoming slippery and dangerous. Moss Killer 24 oz. Ready-to-use Spray Bottle Moss Killer One Gallon Ready-to-use-Spray Moss Killer Concentrate (One Gallon makes 4 gallons of spray)