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Some wax-based hair removal kits have a thin cylindrical vial of blue liquid--ask your wife for some. If you take a Q-tip with some of that liquid (I think it's a light oil) and gently rub away at the sticky goo followed by water on the other end of the Q-tip followed by a dry cloth you should be gooless.
My wife also suggests trying candle wax remover or medical bandage goo remover wipes. I have tried the medical bandage goo remover wipes and the blue liquid on gooey plastic with success.
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I've used a product called "Goo Gone" on lots of sticky stuff, like tape residue, etc. It seems pretty gentle, but if you try it, you'll want to test it somehow. (I don't know that I've yet used it on a calculator.)
Good luck!
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This is flexibilizer, used in a lot of plastic products (like plastic bags or plastic cases). I don't think there is a method to get rid of it again without damaging the plastics.