Just start a thread about using a pressure washer on your RV and you'll get a dozen people telling you that a pressure washer will peal the decals off in a heart beat.
Seriously, a heat gun is probably the best way to remove a decal.
hershey - albuquerque, nm Someday Finally Got Here
My wife does all the driving - I just get to hold the steering wheel.
Expedition - Suzuki Grand Viagra
Warm it up with a hair dryer (I find a heat gun gets too hot), peel it off (don't use anything sharp to pick at it) and clean up the residue with 3M Adhesive Remover (won't hurt the finish)....Brian