Published March 18, 2026
The dark streaks running down Horseheads roofs are gloeocapsa magma, a hardy algae that feeds on the limestone filler in asphalt shingles. It spreads by airborne spores, which is why entire neighborhoods green up together.
Pressure washing a shingle roof strips the protective granules and voids most manufacturer warranties. Every major shingle maker specifies a low-pressure chemical clean instead.
Our soft-wash process applies the solution, lets it dwell, and rinses at garden-hose pressure. Streaks continue to fade for a week or two after the visit as rain carries away the dead growth.
Homes in Horseheads and across Chemung County typically need this every three to five years.
Related service
Low-pressure, detergent-led cleaning for delicate surfaces.
Soft Washing in Horseheads, NY