What is the best way to remove residue from a slab?
I am sure that I am not the only one who comes across a graded card that has residue on it's slab from a price sticker. I have always removed the residue with a clean cloth but many times it just spreads the residue evenly along the rubbed area. I've tried window cleaner in the past but that didn't help.
Has anyone found an easy way to take off this residue withour burning a hole thru the slab?
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