You scrub those dark streaks off your roof, and three months later they're back like they never left. Here's the truth, you're not cleaning a stain, you're dealing with algae that's literally eating your shingles. Those black marks aren't dirt. They're colonies of gloeocapsa magma, a type of bacteria that feeds on the limestone filler in asphalt shingles. When you pressure wash them away, you're only removing what's visible on the surface. The roots stay embedded in the shingle granules, and they start spreading again as soon as the moisture returns. A Roofing Contractor Wimberley, TX can apply zinc strips or treat your roof with solutions that actually kill the organism at its source. Sometimes the damage goes deeper than cleaning can fix, and you need a Siding Contractor Wimberley, TX or Roof Replacement Services near me to assess whether those shingles are too far gone. Western Skies Roofing & Construction : https://www.google.com/maps?cid=9229191897320819968 Read the full story : https://socialytime.com/blogs/118476/Why-That-Roof-Stain-Keeps-Coming-Back-Even-After-You