This experiment...
https://www.hesolarllc.com/cleaning-dirty-solar-panels/
seems to indicate a two to three percent improvement in output after cleaning.
This somewhat less scientific article...
https://www.popularmechanics.com/sci...f-solar-power/
suggests much larger losses.
My guess is that if you live at a higher latitude where it rains frequently, it's nothing to worry about. Much better to concern yourself with the very poor efficiency of the cells themselves.

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