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Acetone(nail polish remover) will wipe your discs clean be careful not to get it in the stamp as it will strip that also.
I just tried acetone based nail polish remover a few mins ago & it faded the permanent marker just slightly. (Maybe better if 100% acetone?) Also tried WD40, baby oil, goof off (before I read earlier post, no damage noted but I also didn't allow it to sit long on the disc), hydrogen peroxide, 100% ethyl alcohol, & graffiti remover....ugh, all to no avail. Sounds like Kaboom might be next... Hope this info helps. Pls keep posted on what ended up working best for u.