Wet and Forget Outdoor, the easy spray and leave outdoor cleaner. Eliminate tough moss, mold, mildew, lichen and algae the easy way. Simply dilute Wet and Forget with water, in a pump-up garden sprayer and apply to your walkways, roofs, siding, deck or any other outdoor surface and your job is done. Wet and Forget goes to work with the wind and rain to gently clean the surface over time. No more scrubbing, rinsing or power washing. Wet and Forget gentle, bleach-free formula is safe for use on virtually any outdoor surface.