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SoapyIts not the panels that are the problem its the cables, if they get a split in them which can happen and water and carbon are perfect conductors of electricity
It's good enough to clean the insulators of a 500,000 volt power line. http://www.youtube.com/watch?v=lcjhjna9jZE
Heres one for the Working at height regshttp://www.youtube.com/watch?v=gPvCuc1_mgM