This is the problem with these immaculate mirror finishes on modern coins. Even one FRESH fingerprint will be nigh impossible to remove without leaving something you will be able to see under artificial light. I like to at least be able to decontaminate my coins before sealing them up, so a precision field would not be for me (unless bought as new), as much as they have wow-factor. I like to be able to gently 'clean' the surfaces of my coins with acetone and a cotton bud, which you can do on everything bar proofs! I'd still sit a proof in a bath of acetone, but would'nt attempt anything else. Point being, if you are going to take it out, don't touch it whatever you do!