Solar panel cleaning robot.
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Previously:
https://www.homemadetools.net/forum/...546#post197240
https://www.homemadetools.net/forum/...764#post111513
https://www.homemadetools.net/forum/...254#post184901
https://www.homemadetools.net/forum/...550#post225323
https://www.homemadetools.net/forum/...111#post195404
