Roof Cleaning

By Kenny Monks, owner of Rooted Exterior Solutions · Updated September 2026 Short answer: yes. Pressure washing an asphalt shingle roof strips the protective granules off the shingles and can shorten the roof's life. The Asphalt Roofing Manufacturers Association (ARMA), the trade group for the companies that make the shingles, says never to use a pressure washer on an asphalt shingle roof. The safe way to remove black streaks, algae and moss is a low-pressure soft wash. What