Wet & Forget is the easy, one step solution to removing outdoor moss, mold, mildew, and algae. EPA (Environmental Protection Agency) registered. Non-caustic, non-acidic, and contains no bleach or phosphates. No scrubbing, rinsing, or power washing required. Safe for all outdoor surfaces. Ideal for cleaning vinyl siding, decks (wood and composite), porch steps, window ledges, boat seats, play equipment, and roofs. Product works gently over time. Safe around plants and landscaping when used as directed.