Newbie Question About Acetone

Pure acetone doesn't alter the coin, doesn't react with metal and doesn't remove tarnish, so it shouldn't get bagged as cleaned. It just dissolves organic matter, goo, grease and the like. It also doesn't leave behind any residue (other than what was already there) and evaporates completely. In that sense, it's safer to use than water. You might get bagged as cleaned if you wipe the coin leaving hairlines, but that's because you mishandled it, not because of the acetone.

The negatives - you have to be careful with acetone because it dissolves all sorts of plastics, paints and rubber, and has some hazardous properties. Be sure to have plenty of ventilation, be careful with what tools and containers you use, don't get it in your eyes, expect it to dry out your skin, etc. You can also easily mishandle a coin. Practice on non-valuable coins first.