The spit thing will help too. I always forget to do it before I light my pipe, but when it does get a bit dark after a few lights, I will use spit to remove it. I used to be way more obsessed about darkening the rim. I was attracted to pipes with a polished rim with nice grain, ugg, but now I just accept what effects smoking as on the pipe as a sign of a well loved pipe. But, I do tend to use a polish cloth and spit to get them all nice and shiny after I've finished smoking and cleaned out. I do love the way my pipes look, and I want to keep then as nice as possible. Just not AS obsessive as I used to be, ha ha.