The black streaks and stains on your roof are corrosive fungus and bacteria. These microbes can eat into your shingles slowly decomposing your roof.
Soft washing is better than power washing for cleaning your roof
- Power washing is abrasive and damaging to most roofs
- Power washing only removes fungus/bacteria on the surface
- Soft wash kills fungus/bacteria build up at the root while power washing only removes microbes on the surface