Clean up your roof with Spray & Forget Revolutionary Roof Cleaner Concentrate. This roof cleaner uses a fast-acting formula to remove stains caused by algae, mold and mildew -delivering results in minutes, not weeks! Packed in a 1-gallon bottle, this concentrate can make up to 10 gallons of cleaning solution-enough to cover 1000 to 2000 square feet. Spray & Forget is an ideal roof cleaner for asphalt shingles, wood shingles, slate shingles, clay shingles and tile shingles. DIRECTIONS FOR USE: 1) Mix 1:9 ratio of product and water. 2) Rinse surrounding plants with water. 3) Spray mixture from pump sprayer on roof. 4) Wait 1 minute while foam works on stains. Most stains will turn orange when cleaning. 5) Rinse roof with water until orange color is gone. 6) Repeat if necessary (darker stained roofs may need multiple applications). 7) Rinse surrounding plants, gutters and decks with water when finished. Use only as directed. For outdoor use only.