1964 Proof Jefferson Nickel with rainbow tonning and what appears to be fingerprints?

Haven't been on here in awhile. So recently I bought a roll of 1964 Proof Jefferson Nickels and last night I was looking through them and found one about half way down the tube that has very light, almost unnoticable at first glance rainbow tonning. Upon furth inspection and with the use of latex gloves (sorry didn't have my cotton gloves.) I seen some fingerprints, not a full on thumb print but more like the side of the finger. Now the question. Is there a safe way to remove those prints without ruining the tonning? A quick dunk in soap and water perhapse? Sorry no pics, plaus I wouldn't be able to capture the tone.

 

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Here is what I learned recently. A soak in some acetone will remove the fingerprints. In theory it shouldn't remove the toning. That is assuming the toning is actually the metal composition and not a foreign substance on the coin itself. I soaked a rainbow toned cent a couple weeks ago because it had tape residue on the reverse. The residue all came off, but so did most of the toning. That is because the toning was from finger oil, or something other than the metal itself. Hope this makes sense.

Here was the cent I am referring to:

 

Thanks for the reply gbroke. How about hot water and soap instead of a chemical.

 

Chances are it is to late to remove the fingerprints. But an acetone bath might help, but don't hold your breath

 

If you got a friend on the police force have them run the print - it could be from someone famous.