[kiwi_steve]

I've had good luck with IPA (rubbing alcohol) and a cotton bud... never taken any of the ink off yet. I then give a rub over with an almost dry soft cloth - slightly wetted with 3-in-1 oil... just enough to give it a shine. I've done this on a couple of them now with good results. The only problem I've noted is that the oil can attract, and retain, dust. I'm sure there are better options for the rub over... maybe nothing is a better option - but I just prefer the look.

As with anything, your mileage may vary... test in a corner first...

Cheers

Steve