Rust-Oleum Multi-Purpose Pressure Washer Concentrate is the Pro's choice to make outdoor cleaning jobs easier. The fast-acting, bleach-free formula is the ideal solution for effectively removing grease, grime, stains from mold, mildew and algae, oil, fungus and more from a variety of exterior surfaces; no scrubbing required. Rust-Oleum Multi-Purpose Pressure Washer Concentrate contains anti-corrosive agents to safeguard pressure washer parts. Application: Outdoor Surface Cleaner; Applicable Material: Brick; Cement Block; Concrete; Driveways; Gutters; Masonry; Roofing; Siding; Chemical Compound: Proprietary Blend of Detergents; Foaming Surfactants; Dye; Physical Form: Liquid.