The best all around sticky adhesive remover for any surface is Acetone. There is a little of this in nail polish remover, but you need the straight stuff! Use latex gloves when using and watch out for sparks or any flame.
Very flammable liquid. Also harmful vapors. If this doesn't do it, you will have to find an industrial chemical that's only available through a licensed dealer or some kind of professional business.
In other words, you'll have to pay someone to do it for you. Acetone evaporates quickly and should not cause harm to the paint. If it does, then so would have anything else that could remove that adhesive.
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