Can you use a regular pressure washer to clean a roof?

Not safely at typical driveway pressure -- roof soft washing uses very low pressure (often under 100 PSI) combined with a cleaning solution, relying on the chemical rather than pressure to remove algae.

What causes black streaks on a roof?

Black streaking on asphalt shingles is typically gloeocapsa magma algae, not dirt, which is why a plain-water rinse alone won't remove it and why chemical dwell time matters.

Will soft washing void a roof warranty?

Properly done soft washing with roof-safe chemicals at low pressure generally does not void warranties, while high-pressure washing on shingles often does -- always check the specific manufacturer's cleaning guidance before starting.

How to Soft Wash a Roof Without Damaging Shingles

The correct low-pressure soft washing process for asphalt shingle roofs, common mistakes that void warranties, and how to price roof soft washing jobs.