The best chemicals for pressure washing depend on the type of stain being removed, but most professional cleaners rely on a few core products. The most common is sodium hypochlorite (SH), a bleach solution that kills algae, mold, and mildew on siding, roofs, and concrete. It is often mixed with surfactants to help the solution cling to surfaces and improve cleaning results. For oil and grease stains on driveways or commercial areas, cleaners may use strong degreasers such as Dynamite Degreaser or Concrete Crew, which break down heavy grime. When dealing with rust stains or mineral buildup, acid-based cleaners like Rust Remedy are often used.

The best chemicals for roof cleaning are those that safely remove algae, mold, and mildew without damaging shingles. The most commonly used chemical is sodium hypochlorite (SH), a bleach solution that kills organic growth like the black streaks often found on roofs. Roof cleaning mixes usually include water and a surfactant to help the solution stick to the shingles and work more effectively.