If you’ve ever looked up at your roof and noticed black streaks, green patches, or even reddish stains, you’re not alone. Roof stains are common, but they’re more than just cosmetic issues—they can signal what’s happening to your roof’s surface. At PowerShine Roof & Exterior Cleaning, we help homeowners understand the problem and fix it safely with soft washing.

1. Black Streaks

Cause: Typically caused by Gloeocapsa Magma, a type of algae that thrives in humid environments.

Meaning: The black streaks are not just dirt—they’re living organisms feeding on your shingles, breaking down limestone filler, and shortening roof life.

Solution: Soft washing kills algae at the root, restoring your roof’s color and protecting its integrity.

2. Green Patches

Cause: Moss or algae growth. Moss is thicker, spongy, and often found in shaded, damp areas of the roof.

Meaning: Moss holds moisture against shingles, which can lead to rot, lifted shingles, and leaks if left untreated.

Solution: Gentle removal with soft washing eliminates moss without damaging the shingles.

3. White or Light-Colored Stains

Cause: Mineral deposits, efflorescence, or leaching from roofing materials.

Meaning: Usually harmless but can indicate moisture issues beneath the surface.

Solution: Professional cleaning removes the buildup while checking if water is seeping into areas it shouldn’t.

4. Brown or Rust-Colored Stains

Cause: Rusting metal elements like flashing, chimneys, or vents dripping onto the roof.

Meaning: Could signal aging or corroding roof components that may need repair or replacement.

Solution: Cleaning removes the stain, and inspection ensures the metal isn’t deteriorating further.

5. Red or Orange Stains

Cause: Lichens—a combination of algae and fungus—or sometimes rust runoff.

Meaning: Lichens attach strongly to shingles and can break down protective granules, shortening roof life.

Solution: Careful soft washing is needed to eliminate lichens without damaging the roof surface.