Isopropyl alcohol would do it. Extremely unlikely to do any damage, but try on one first just in case. Use cotton pads. And get some 99.99% stuff, not this "rub

Isopropyl alcohol would do it. Extremely unlikely to do any damage, but try on one first just in case. Use cotton pads. And get some 99.99% stuff, not this "rubbing" crap.