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