Get rid of stubborn green and black stains with Wet and Forget Outdoor. Just dilute with water, spray it on, and forget it. The Wet & Forget Outdoor Concentrate is ideal for precise applications on surfaces such as sidewalks, decks, pavers, siding, outdoor rugs, retaining walls, fencing and more. Wet and Forget Outdoor Cleaner works over time with the rain and wind to gently clean up moss, mold, mildew and algae stains. No scrubbing or rinsing required. In most cases, surfaces stay clean for 1+ years after treatment with Wet and Forget. The Wet and Forget Concentrate makes 6 gallons total. One bottle covers an extensive 750-2,250 sq ft. Wet and Forget is bleach-free and non-acidic. Life's dirty. Clean easy with Wet and Forget Outdoor.