Remove loose moss with a soft-bristle brush or plastic scraper
Clear gutters and downspouts
Apply a roof-safe moss remover
Use a low-pressure rinse if recommended by the product
Repeat treatment as needed
Trim overhanging tree branches to reduce shade and debris
Improve roof drainage and airflow
Install zinc or copper strips near the roof ridge
Keep the roof clean of leaves and twigs
Inspect the roof regularly and treat early growth promptly