Wet and Forget Moss Mold Mildew & Algae Stain Remover Net 0.75 gal (MAKES 4.5 GALLONS) ONE BOTTLE * Simply spray & walk away. No scrubbing, rinsing or pressure washing! * Attacks the problem from the root level for longer-lasting results. * Safe for use around plants. - A pH close to water. - Safe for any outdoor surface. * Non-caustic, non-acidic, and no bleach.