Try the discwasher fluid, if it disolved it once it should do it again.
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I use what is called Goo Gone, which cost 3 to 4 dollars in most hardware stores such as Menards. This safely removes adhesives and sticky gook from everything Ive used it on. Its super for removing sticky labels from CD's and cases, crayon marks and many more uses. It has removed things I thought would never come off. It only takes a little then gently wipe off with a clean paper towel.