Generally, solar systems are maintenance free, and will be providing power for over 25+ years.
Cleaning solar systems is not generally necessary, unless birds have done their business on the face of the panels. A study done in Tucson, Arizona showed that cleaning solar panels increased production output by less than 1%, which does not justify the cost associated with professional cleaning.
If done by a do-it-yourself-er, its best to be sure to not use water that will leave hard water stains!
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