You've scrubbed those dark streaks on your house with everything under the sink, and they won't budge. That's because they're not dirt, they're algae. The black stains growing on vinyl siding feed on moisture and multiply in shaded areas. Regular soap and a brush can't kill the spores embedded in the material. You need the right cleaning method to remove them without damaging your exterior. A Pressure Washing Service Port Chester NY knows how to treat algae without blasting away paint or warping panels. It's the same precision work a Paver Sealing Company near me would use to protect walkways after cleaning. The trick isn't scrubbing harder, it's using the correct technique. Sealcoating By Sam's Landscaping : https://www.google.com/maps?cid=6455514313917383434 More about this : https://gulfsena.com/blogs/59219/Why-Those-Black-Streaks-on-Your-Siding-Won-t-Scrub