Heating and peeling is probably your best bet...After you peel it though, I would pour some mineral spirits on a rag and gently rub the excess adhesive off. Don't worry, mineral spirits is not harmful to your finish, i've done it on 4 cars so far (Including my tC) and it has yet to produce any adverse effects...even after 5 years on my Expedition!
The only thing I recommend doing after talking the extra adhesive off with mineral spirits is re-applying a coat of wax to the area because mineral spirits takes the wax off along with the excess adhesive.
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-JWT
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