Acetone works well on fiberglass, but will affect some paints. I think the fine rubbing compound or something like Meguiars Ultimate compound would work better on paint...
I replaced the full length decals on my 90 GeorgieBoy. I had good luck using a small amount of dawn dish detergent in a bucket of water to just wet the surface before applying the decals. The decals can be re-positioned easily. Squeegee the decals when you have them in position.
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel
Our Pug "Lily" & "George" the Newfoundland