year is usually enough to catch algae before it becomes heavily established.
One Important Detail
Green staining is often algae, but dark or fuzzy growth can sometimes be mildew, mold, moss, or another type of biological growth.
If staining keeps returning unusually quickly, covers a very large area, or appears to be associated with water entering the wall, investigate the moisture source rather than repeatedly
cleaning the surface.
The Bottom Line
The easiest way to remove green algae from siding is often not aggressive scrubbing at all.
Apply a siding-safe
