Best Way To Clean This Coin

I wish acetone was $7 a quart here... I paid £3.95 (about $6) for a tiny bottle of pure acetone at the chemists which all went within a week (I gave several coins a wipe over with cotton wool dipped in it, it evaporates fast like that)

I tried hardware stores who all stocked White spirits and Celulose thinners but no acetone...the small bottle I got was too tiny to dip the coins (they wouldn't fit inside the neck of the little glass bottle if I had tried) hence the cotton wool.

Also I wouldn't conssider that it is spending $7 on that coin, I would consider it as spending $7 on any coin you need to clean in the next few years.

Never, ever use what you THINK is a mild liquid soap or detergent on coins. All soaps are made different and some contain all sorts of chemicals that could really damage a coin. Some also contain harsh abrasives such a one called Lava. Just do not use soaps on coins.
By me Acetone is also sold in places like Walmart, Kmart, Sears, Target, Menards, HomeDepot, all paint stores, etc. Usually it is about $4/quart plus or minus a little. In some areas the sales taxes are almost as much as the Acetone.
And too, distilled water at Walmart is usually $0.88/gallon.
And remember that if you have to much Acetone, it can be used to clean paint brushes. The main thing about Acetone is how to use it safely. I suggest if you do try it, use the Search tab at the top for Acetone, coin cleaning, etc.