Naples Roof Algae & Black Streaks — The Cyanobacterium Behind the Stains and Why Standard Cleaning Fails It
After 11+ years and 8,000+ Naples cleanings, here’s what’s actually causing the black streaks — Gloeocapsa Magma, a cyanobacterium with a UV-protective sheath. Why pressure washing doesn’t kill the holdfast and standard cleaning fails at 6–12 months in Naples climate.