I've (sparingly, mainly because I'm careful to begin with) used rubbing alcohol (well, lab-grade isopropyl alcohol, actually ;p) on eReaders over the years, to no ill effect so far.
(As usual, alcohol on cotton/microfiber cloth, not the screen directly, and gentle wiping motions. The purer the solution, the better. Which means asking your pharmacist nicely over here, because reasons).
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