naptha (zippo fluid) works wonders, finish with a little light polishing compound and it'll be gone. I had to remove a base decal from my painted bumper. this worked great. just take your time, give it some time to soak in, use a piece of cloth like a compress so the naptha does not get everywhere or evaporate immiediatly. use your thumb to roll the adhesive into a localized glob and pick off. If the adhesive has lost it's tackiness and elasticity then rubing compound will take it off.