Gpm deck wash, gallon bottle – 776107 this deck wash is a fast acting, no-scrub wood revitalizer. Cleans in minutes. Restores natural look to weathered wood. Removes dirt and stains caused by mildew, algae, and fungus. Designed to clean, revitalize and remove discoloration caused by mildew, algae, fungus, and dirt stains from wood decks in minutes without scrubbing.