
To the place for coin cleaning.

Depending on how bad the toning, tarnishing or whatever is on those coins is, you may not want to chance any cleaning at all. Remember that the darkening of any coin is usually due to the outer layer of the coin's metal with another substance. Sulfur, Oxygen, Chlorine, etc. Regardless of what caused the discoloring and/or darkening, when that is removed, so is some of the original metal of the coin.
As an example with old, antique furnature, some people samd them all down to make them look pretty. This usually completely ruins them due to the loss of the original material. Similar with coins. It is always best to leave them alone and as is.
Dipping in the stuff you used is sort of like Tarn-X, Jewery Cleaners or even a strong acid.
Since the subject of cleaning coins comes up so often, you could try the Search tab at the top for coin cleaning, cleaning coins, Acetone, etc.