Yes, I pull my buff down below my mouth to prevent this though I don't have any long descents to contend with…
same. for most of the ride the buff is around my neck. but i find that when i actually get into the urban and downtown areas where i spend a lot more time stopped at lights etc and there is a shitty cross-wind that i can keep the buff on since i'm not breathing so hard.
also, i've been told by friends of mine that you can get wool buffs that are more breathable and don't get all funky with moisture.
"You know what's wrong with Vancouver? You can't pee off of your own balcony without getting in trouble"
- Phil Gordon