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Clean My Panels
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Most systems do well with a cleaning about twice a year, but your climate decides. Check your warranty first, and skip the pressure washer.
EnergySage says to clean about every six months, and notes that it really depends on your location. Dusty or heavily wooded areas may need more. Regular rain can wash panels clean enough to skip a visit (EnergySage on solar panel cleaning).
If you clean from the ground, a hose, mild dish soap, and a soft rag are the usual tools. Never use a pressure washer, since it can crack panels. Do not climb onto a roof if you are not trained for it.
Improper cleaning can void a warranty, so read your terms before you or anyone else touches the glass. If you lease your system, cleaning may already be included in your agreement.
Sources
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