Modern coins that have some numismatic value should not be cleaned generally.
Use the search line here on CCF, there are topics about cleaning coins, copper coins, using acetone on silver coins, etc. There's some YouTube videos about cleaning coins but be careful, learn about it first, experiment with just face value coins with no numismatic value.
Saying "never clean coins" does not apply to all circumstances. Ancient coins are usually cleaned. Modern coins found in the ground often need to be cleaned of their encrustation, dirt, etc. Modern coins with problems can be conserved/restored. Inexpensive circulated coins can be cleaned to improve appearance and just for fun IMO.
Edited by livingwater
06/13/2023 11:50 am