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Not worth the hassle even thinking of trying as the panel would have to be removed from the roof first and that in itself would be no easy task to do. Then there would be no guarantee you would get them clean..
I have done one just like this before. You will need to remove the panel by lifting the strips holding the panel in the remove the tape surrounding the panel. Flush out the channels with a hose leave the panel dry in the sun and replace the alu tape and put the panel back on the structure and replace the holding strips with a plastic mallet.