How to safely remove an unknown type of glue from acrylic lamp shade.


I was given a previously owned acrylic swag lamp which had cut out wall paper designs on it. I removed them but there is hard glue residue left on the shade that I haven't been able to remove. I've tried WD40 and Goo Gone. What other products can I safely try on acrylic that might remove the unknown type of glue that's on it?

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