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Posted By: Erland Stevens

This may sound kind of lame, but sometimes a good thing to remove sticker residue is another sticker. Put a new sticker on the residue of an old one, and then slowly peel off the top one. Repeat as needed with the same "new" sticker. You should see some progress after a few tries. I've never tried it on a slab (because I don't have any), but it works great on sheet protectors.