Acetone

If you type in acetone in the box upper left "Search Coin Community" you will find plenty of information to read.

i use acetone for the coins we are keeping. I soak for anything up to a week, checking the colour of the acetone several times and changing it when it discolours. some coins it helps others it doesn't seem to do much at all, but mainly I use it to remove grease and oils from the coin, which can be done in a few seconds by, using 2 jars with clean acetone, place coin in first and give it a gently stir so the coin doesn't move, remove and place into second clean batch and repeat. remove and put coin on a microfibre cloth turning the coin without touching it, several times in 5 or so seconds till it is dry. put coin into holder without touching. thats pretty much my method.
i also put coin into deminerlized water to soak them clean, cheaper but takes longer and doesn't remove grease and oils.
|read the safety sheet of acetone, its dangerous stuff if handled wrong.