You scrubbed that dark streak off your roof last summer, and now it's back again like it never left. What you're seeing isn't just dirt, it's algae growth that feeds on the limestone filler in your shingles. Most homeowners don't realize that pressure washing actually makes the problem worse by damaging the protective granules on your roof. The spores are still there, buried in the material, waiting for the next rainy season to bloom again. A Roofing Contractor Wimberley, TX can apply specialized treatments that kill the root cause instead of just masking it. Sometimes the damage runs deeper than a cleaning can fix, and you need a Siding Contractor Wimberley, TX to assess whether your exterior materials are compromised. Prevention beats repetition every time. Western Skies Roofing & Construction : https://www.google.com/maps?cid=9229191897320819968 More about this : https://socialytime.com/blogs/118476/Why-That-Roof-Stain-Keeps-Coming-Back-Even-After-You