Roof Cleaning in Houston: Why Soft Washing Matters for Your Shingles Those black streaks on your roof aren’t dirt. They’re living algae eating away at your shingles. If you’re searching for reliable roof cleaning in Houston, here’s the direct answer: soft washing kills the algae’s root system without stripping your shingle granules, while pressure washing only blasts off the surface and can void your roof’s warranty. Read more at https://zealwashing.com/roof-cleaning-in-houston-why-soft-washing-matters-for-your-shingles/