Use an alcohol pad like you'd find in a first aid kit. Works on all types of glossy cards. Run the pad around in small circles and the ink will come right off. Be careful not to get the ink onto the edges of the card. The edges are not coated with UV gloss and the ink will bleed into the them. You might need a couple pads but this is what I've found to be the easiest, most non-harmful way of doing this. Erasers sometimes leave marks on the card surface and you run the risk of damaging the card. I also find it is a lot tougher to remove the auto completely using an eraser without using a bit of force. I do a ton of in-person autographing and have done this many times successfully. Just be careful and go slow and you should have no problem.
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