Roof Cleaning Services in Bethesda, MD

Those dark streaks running down your roof are not just an eyesore — they are a living organism called Gloeocapsa Magma, a species of cyanobacteria that feeds on the limestone filler in modern asphalt shingles. Left unchecked, this algae shortens the lifespan of your roof, traps heat, increases your cooling bills, and can spread to neighboring roofs. In the humid Bethesda climate, almost every roof more than a few years old shows some level of growth, especially on north-facing slopes.

Our professional roof cleaning service uses the soft wash method recommended by the Asphalt Roofing Manufacturers Association (ARMA). We apply a specialized low-pressure solution that kills algae, moss, lichen, and bacteria on contact. The roof is then gently rinsed and the dead organisms continue to fall away in the weeks following treatment, revealing a clean, uniform appearance that can add years to your shingle warranty.

We never use high-pressure equipment on your roof. High pressure strips the protective granules from asphalt shingles, voids most manufacturer warranties, and can force water under the shingles into your attic and walls. Our trained technicians work from ladders and use specialized soft wash gear to deliver a clean roof without ever standing on the surface in a way that risks damage.