Have to sort of agree, GUNK is a degeaser, not really meant for paintwork and will remove grease from bearings if allowed to get in. I have used it on the bike, but wash off quickly.
You would be far better off to either buy some GREEN GUNK, which is not quite so harsh, or a branded bike cleaner.
I pressure washer will help, but again be careful not to wash grease out of bearings.
Of course, there is always the option to pay a bike cleaner to do the job for you !!!!!