Sally, panels are self cleaning it rains that often should just clean themselves. I have come across one problem in all my years and that was when we had the volcanic ash a few years ago.
The cleaner the better the panel will work.
When the Mars rovers Spirit and Opportunity were only guaranteed to work for 90 days, because they thought the solar panels would be affected by Martian dust. This shows that even NASA knows that dirt and dust on panels affects performance.
Luckily for interplanetary knowledge, the Martian weather kept the dust to a minimum, but does show that keeping the panels clean does increase output.
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