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Liquid TSP Substitute is a phosphate-free concentrated cleaner - one gallon of Liquid TSP will make up to 16 gallons of cleaning solution (cleans approx. 6400 sq. ft.) and requires no rinsing. Recommended for walls, woodwork, ceilings, concrete, metal, vinyl and aluminum siding. Removes mildew stains when mixed with bleach. Can be applied by hand or with a pressure washer.