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Assuming you're talking about the inner fairing...if you use anything chemical, test it on an inconspicuous spot first. That flat black finish will come off.
the dealer generally cleans a bike when you take it in for service...why do anything more?
My last one would have been pretty dirty, 80,000 and never dealer serviced, except for having to do warranty work at 12,000 miles and again at 30,000 miles.