This does not work on all discs.
 Use a belt sander on the top side of the disc. This should be done in an easy-to-clean area.
 Soak a cotton pad in pure acetone, then wipe the bottom of the disc with it. It should become frosted and unreadable.
Cover the disc with duct tape, then rip it off.
Sand the discs.
Wipe with acetone.
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