Cleaning Fiberglass 5th Wheel

#1
I am seeking recommendations re cleaning my fiberglass 5th wheel with a rubber roof. Can I use a pressure washer? Pressure washer with hot water? On the rubber roof as well as on the fiberglass sides? What kind of soap or cleaning agent should I use? Can one have a trailer cleaned at truck stops or RV dealers? If so, any estimate on cost. My 5th wheel is 27'long and has no slideputs.

Thanks,
 
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