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While it’s not completely necessary for them to operate properly, as the occasional rainfall can rinse away dirt and debris, manually cleaning solar panels from time to time can keep them operating more efficiently.

Dirt, debris, pollen, and bird droppings can collect on the surface of the panels. Depending on the amount of solar panels you have, this can add up over time, so set a regular maintenance schedule. Moreover, if you live in a climate with little to no rainfall, more debris can accumulate, causing inefficiencies that would be clear in your electricity bill. 

The best way to clean a roof without damaging it is to opt for soft washing, or better yet, leave it to a professional roof cleaner. Soft washing involves a biodegradable cleaning solution being sprayed on the roof and gently rinsed away after it dissolves built-up residue on your shingles. 

Roof cleaning can damage shingles if it’s done incorrectly—like with a high-power power washer—but it likely won’t damage your roof if you pay to have an expert do the work. A professional roof cleaner will use a gentle cleaning solution and a cleaning method that matches your roof material to ensure the process doesn’t damage the roof. Some homeowners worry that roof cleaning will shorten the life of their roof by removing shingle particles or protective coatings, but it often extends roof life by removing plants that cause damage and improves your home’s curb appeal simultaneously.

No, you should not pressure wash or power wash roof shingles, including asphalt shingles. The high water pressure from these machines is too strong and can damage the shingles by forcing water underneath, loosening their adhesive, and causing them to fall off. A safer and better alternative is soft washing with a pump sprayer. To ensure the job is done safely without causing damage, it is best to hire a local roof cleaner.