Concrete and Driveway Washer Concentrate handles grease, oil, outdoor pollutants and biological stains and cleans concrete, brick, block, slate and more. Use in pressure-washers or manual cleaning. Labeled directions ensure equipment and landscape safety. Safe for areas visited by kids, pets and wildlife, the nontoxic cleaner has no added fragrance, chlorines or phosphates. Powerful pressure-washing formula is concentrated for 10 times extended coverage value, covering up to 5,540 square feet at lightest solution.