Black or green roof algae streaks are common in humid climates. A bleach-free outdoor cleaner can treat organic staining without a harsh sodium hypochlorite approach when used as directed.
Residential steps
- Clear loose debris from the surface.
- Spray evenly with a garden pump sprayer.
- Do not rinse for standard Citra Shield treatments. Let weather help lift staining over time.
Which formula to buy
- Ready to Use for smaller roof sections
- Concentrate for larger roofs and recurring maintenance
- UV Shield when sun exposure and fade are also concerns
More: roof cleaning · no-rinse outdoor cleaner · Citra Shield vs Wet and Forget