My neighbor taught me this trick to clean green algae off siding with 0 effort. Here’s how it works

remain clean for years, while a shaded wall in a humid environment may develop green staining much sooner.

Inspecting the siding once or twice a 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