Uniquely formulated to penetrate and deep clean stains from Algae, Mold and Mildew. Safe to use around your yard, plants and lawn. Works on a variety of different surfaces like wood decks, concrete sidewalks, asphalt driveways, brick walls, most canvas awnings, composite, vinyl siding and plastic outdoor furniture. Works quickly to clean grungy and slipperysurfaces, just spray on and hose off. No need for pressure washing. Cleans up to 200 sq. ft. per gallon on porous surfaces and up to 600 sq. ft. per gallon on non-porous surfaces. Extended coverage 600-1800 sq. ft.