Answer (1 of 8): The general rule of thumb is to never clean coins. Ever. This is particularly important with valuable coins, because a speculator might clean the coin to improve it’s worth - but most cleaning actually is visible to coin graders, and such attempts actually reduce the coins value.
How to get rid of a bucket of pennies - Quora
What will be the price of an 1857 old silver Indian coin with a queen photo? - Quora
What's the best way to clean a coin? - Quora
Quora launches Poe, a way to talk to AI chatbots like ChatGPT
What's the best way to clean a coin? - Quora
How to clean an ancient coin - Quora
How to clean an ancient coin - Quora
How to tell if a coin has been cleaned - Quora
I have a gold hole dollar of 1801 to 1809. How much is it worth? - Quora
What's the best method for cleaning buried old coins without ruining the patina? - Quora
What are some rare Indian coins and notes? - Quora