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not sure on cleaning , but refocusing should help
Congratualtions on the cool token!
IMHO, I would not clean (by chemical, electrical or mechanical) any old coin, especially if copper (a lesson learned many years ago). Now my silver coin finds, I use only water without rubbing.
I have soaked LC's and KG coppers in mineral oil to help remove some of the crud, since fertilized farms are not kind to copper coins.
GL & HH