02/14/2026
Those black streaks aren't just "dirt"—they're actually eating your roof! 🛑🏠
Most homeowners think those dark stains are just soot or mildew. The truth? It’s a hardy type of algae called Gloeocapsa Magma. 🦠
It feeds on the limestone filler in your shingles, making them brittle, causing granule loss, and cutting years off your roof’s lifespan. If you can see the streaks from the street, the damage is already happening.
At HarcoPressure, we don’t "power wash" your roof. High pressure ruins shingles! Instead, we use our specialized Soft Wash System tha comes with a 3 to 5 year stay clean warranty our process:
✅ Kills the algae at the root (so it doesn't grow back next month).
✅ Protects the integrity of your shingles (no high pressure, ever).
✅ Restores instant curb appeal (just look at that transformation! 👆).
✅ Lowers roof surface temps (saving you on cooling costs).
Don't spend $15,000+ on a new roof when you can RESTORE the one you have for a fraction of the cost.
Ready for a "Roof Health" estimate?
Click the link below or text a photo of your roof to us at (443) 338-0020.
https://harcopressure.com/contact/