I'm waiting for the follow-up question: Do you have green sludge on the nose pads of your glasses? (Not currently, but just because I have plastic frames instead of wire frames currently).
Oh yeah, isn't that stuff fantastic? I think it's green because of corroding metal, but man. That's some nasty stuff.
I go in with a tissue and sort of floss it out every so often.
I can't use metal glasses. The lenses I need are too thick for metal frames. So I've never had this problem!