[Hondaracer]

i think pressure washing will be enough if u have a decent pressure washer

some of those Simoniz car pressure washers have the attachment for a soap etc. could get some mildew remover and attach it in-line

I highly recommend using a good eurethane to seal the panels, its not cheap, like a $50 gallon does 3.5/4 panels, but it looks wayyyy better and it suppose to last a lot longer. My parents did approx 30 panels with it 3 years aho and still looks mint today. I'll try and track down the name of what they used