Removes tough stains such as mildew, mold, dirt, and grease on most exterior surfaces including roofs, siding, decks, and driveways. Safe for people, pets, and plants. No scrubbing, just spray-on and wash-off. 1 gallon cleans 4000 sq. ft. and can be applied by pressure washer, pump-up sprayer, brush, or roller. 32 oz. bottle has convenient hose end attachment.