You scrubbed that dark streak off your roof last summer, and now it's back again like it never left. Here's the thing most homeowners don't realize, those stains aren't just dirt you can wash away. They're algae colonies that dig into your shingles and keep growing back unless you treat the root cause. A quick pressure wash might make things look better for a few months, but you're just buying time. If you want real results, you need a Roofing Contractor Wimberley, TX who knows how to kill the algae properly and treat the surface so it won't return. Sometimes the damage runs deeper than surface stains, and that's when you need professional help from a Siding Contractor Wimberley, TX. Western Skies Roofing & Construction : https://www.google.com/maps?cid=9229191897320819968 More details here : https://socialytime.com/blogs/118476/Why-That-Roof-Stain-Keeps-Coming-Back-Even-After-You