Can you use accetone on clad?

I got some Kennedy halves today at the bank and one was a 1964 and one was a 1967 but the 1967 has something on it that looks like fingernail polish. Can you use the accetone on the clad or is it just better to spend the thing?
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Recipient of the coveted "You Suck" award, April 2009 for cherrypicking a 1833 CBHD LM-5, and April 2022 for a 1835 LM-12, and again in Aug 2012 for picking off a 1952 FS-902.