You scrubbed those black streaks off your roof last summer, and now they're back again. Frustrating, right? Those dark stains aren't just dirt you can pressure wash away. They're algae that feeds on the limestone filler in your shingles, and cleaning only removes what's visible on the surface. The roots stay embedded in the material, growing back within months. Some homeowners try bleach solutions or zinc strips, but if the underlying issue isn't addressed, you're just delaying the inevitable. A Roofing Contractor Wimberley, TX can assess whether your shingles are too compromised or if a Siding Contractor Wimberley, TX needs to check ventilation issues causing moisture buildup. Sometimes the only permanent fix is replacing what's already damaged. Western Skies Roofing & Construction : https://www.google.com/maps?cid=9229191897320819968 Find out more : https://socialytime.com/blogs/118476/Why-That-Roof-Stain-Keeps-Coming-Back-Even-After-You