Designed to clean, deodorize, and prevent mildew for pool and spa covers and solar caps. With cover still on, remove water, leaves, debris, etc. Remove cover and squirt Stow Guard over full area of cover. Using a nylon brush, scrub cover clean adding water to aid in loosening of dirt. Rinse loosened soil with water. If possible allow cover to dry thoroughly. Cover should be stored in a safe place.