Steve, its on nogahyde (fake leather) couches. Its a Sharpie marker, its only been there since last night. There's also a bunch of it on a refrigerator door that we converted to a kegerator.
try using some hair spray....sprayed on to a white towel. Its worked for me on leather with pen ink on it. I would make sure to try an area as a test so that you don't rub the color off
Test areas aren't that big of a deal. I'm asking for a friend of mine, she had a party last night where people wrote all over everyone else's shirts. The marker then rubbed off on the couches, its all over the couches. She said she has tried hair spray, 409, and nail polish remover all with very limited success.
Hogan ...naugahide might present a problem in that it is porus and absorbant. I think the alchohol wiping is your best bet but do it very gently...as said before on a non-porus surface all the techniques listed above would probably work...on the refrig use Pro Polish, but with the leather, no matter what you use, it may leave some marks behind....