Do home remedies kill roof moss?
Short answer. Some home remedies kill roof moss: diluted bleach works well, oxygen bleach works more slowly, and vinegar or baking soda can handle small, thin patches. Dish soap alone is weak. None of them prevents regrowth, so pair any remedy with debris removal, more sunlight, or zinc or copper strips.
Remedies ranked
- Diluted household bleach. Kills moss and algae quickly. Needs plant protection and careful rinsing of metal. The most effective home option.
- Oxygen bleach (sodium percarbonate). Mixed from powder per the package. Gentler on landscaping, slower, may need a second round.
- Baking soda. Sprinkled on small, damp patches, it can kill thin moss. Leaves residue and is impractical on a whole roof.
- Household vinegar. Burns thin moss but often leaves the base alive.
- Dish soap and water. Little effect on established moss; soap based commercial moss killers are a different, stronger formulation.
Remedies to avoid
- Pressure washing: strips granules and drives water under shingles.
- Salt: harms plants and soil below and can corrode metal.
- Iron sulfate lawn moss killer: can leave rust colored stains on shingles and concrete.
- Mixing chemicals: bleach plus vinegar or ammonia creates toxic gas.
How to apply any remedy
- Dry, calm day, with no rain forecast for a day or so.
- From a ladder at the eave where possible, not standing on wet shingles.
- Wait for the moss to brown and loosen, then remove it gently downslope.
What actually keeps moss away
More sun, less debris, and metal ions from zinc or copper strips. See moss and lichen on roofs, trees and your roof and pine needles and leaves on the roof.