Wet & Forget Outdoor, the easy spray & leave outdoor cleaner. Eliminate tough moss, mold, mildew, lichen and algae the easy way. Simply dilute Wet & 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 & Forget goes to work with the wind and rain to gently clean the surface over time. No more scrubbing, rinsing or power washing! Wet & Forget. This item is not available for sale to California.