Thanks all. I was never concerned that my skin oil would penetrate the glass but wondered if it could more or less "burn" to it. Some people have marked with some sort of paint on their tubes. I don't but I suppose if they use the right stuff, it can't be any worse than the original paints that mark the tubes. Some of that is better than others. Bugle boy white paint is one of the worst at wearing off.
Anyway, I'll worry maybe a little less about it but will probably still use them. If I feel particularly dry, I tend to worry less and then I still wipe them down after putting them where they are going. Can't hurt to keep them clean I guess.