The black streaks on your shingles are algae, not dirt, and blasting them off wrecks the roof. Soft washing kills them safely and keeps your warranty intact.
The dark streaks running down Spring Hill roofs are a bacteria called gloeocapsa magma, feeding on the limestone filler in asphalt shingles. Pressure washing a roof strips the protective granules and voids most shingle warranties. The correct fix is a no-pressure soft wash that applies a cleaning solution, kills the algae, and rinses gently.
Beyond the look, roof algae holds moisture and shortens shingle life. Cleaning it is far cheaper than replacing a roof early, and soft washing is the method recommended by shingle manufacturers and the asphalt roofing association.
Pairs well with a house wash and gutter cleaning. See pricing or request a quote below.
Tell us what needs cleaning and where you are. A photo helps us quote faster.
Yes, when it's done as a soft wash. No-pressure cleaning removes the algae without stripping granules, which is what protects your warranty.
A soft-washed roof typically stays clean for a few years, depending on shade and tree cover. Heavily shaded roofs re-grow algae faster.
Most roof soft washes run roughly $400 to $900 depending on size, pitch, and access. You'll get an exact quote after a quick look or a photo.