Help with cleaning old tokens

[PantelisP]

Greetings to all!
A few days ago I decided to sort out my small token collection, by enclosing them in plastic capsules for safekeeping and preservation. I noticed however that some had marks on them (rust/oxidation or dirt?). I wonder if you had any good advice on how to clean them, without further damaging them. I attach some photos.
Thanks in advance!

 

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