The M-1 Deck and Roof Multi-Purpose Cleaner is designed to clean the dirtiest pine, cedar, redwood, cypress and birch decks or siding. It is also effective on asphalt shingle or cedar shake roofs and badly stained or oil spotted concrete in the fastest and easiest way possible. This cleaner also works fast at removing dirt, grease, tree stains, baked-on pollen, mildew and algae stains and weathering. It restores original color to your wood and makes asphalt and cedar shake shingle roofs look new. It cleans and whitens concrete, vinyl siding and fiberglass. This product is a concentrate that dilutes 9:1 with water, making 10 Gal. and will clean about 2,000 sq. ft. It is water based, NON-TOXIC, biodegradable and contains no solvents, phosphates or bleach. Being free of bleach, it will not harm shingles or bleach wood.