The Black Stripes on Your Gutters Won't Wash Off. Here's Why.

You've probably scrubbed them at least once. The vertical black streaks running down the face of your gutters — the industry actually calls them tiger stripes — laugh at soap, shrug off a pressure washer, and come right back through “magic” erasers. That's because they aren't dirt.

What they actually are: your gutters wear a factory paint finish that oxidizes slowly in Florida sun. Rain mixes that chalky oxidation with asphalt residue washing off the shingles and airborne pollution, and every time water clings to the gutter lip and rolls over the front edge, it drags that mixture down the face in the same vertical paths. The residue bonds to the paint electrostatically — it is, in a real sense, fused on, which is why detergent and pressure do nothing. Pressure actually makes it worse over time: blast aluminum gutters hard enough, and you strip oxidized paint in blotches instead of streaks.

Why they keep coming back in the same spots: the streaks map exactly to where water overtops the lip — which means heavy tiger striping is usually a symptom. Gutters full of debris make water crawl over the front edge constantly, repainting the stripes with every rain. So the honest fix is two jobs, not one: clear the inside so water goes down the downspouts instead of over the face, then treat the stripes themselves.

What removal actually takes: a specialty cleaner formulated to release that oxidized bond, applied by hand, dwell time, and a soft brush — face by face, the slow way. It's genuinely different work from a gutter clean-out, which is why we price it as an add-on rather than pretending a clean-out includes it. The payoff is dramatic: white gutters that read “new house” from the street, on the same afternoon.

Do you need it? If the streaks bother you every time you pull in the driveway, yes — it's the single most visible fix on the front of a house. If you're prepping to sell or fighting an HOA appearance letter, definitely: tiger stripes photograph terribly and appraise worse. If you just want working gutters and don't care about the cosmetics, a standard interior clean-out and downspout flush covers the function.

Either way, get the inside cleaned before the faces — otherwise you're paying to remove stripes the next overflow will paint right back. Our instant estimate quotes both together in about 60 seconds, and every job carries the Spotless Promise: not right, re-cleaned free within 72 hours.