Wet and Forget 800003 Wet And Forget Moss Mold Mildew & Algae Stain Remover,0.75 Gallon - One Pack 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.