Ok, I'm repeating what most everyone else said. I use a warm wet paper towel and dab until it's softened or if it's really bad I dip the little butt in warm water - then pick it off with the towel(they peep when you do this - ouch).
Check them frequently - it's easier to get off when it hasn't already hardened into some form of concrete.
Check them frequently - it's easier to get off when it hasn't already hardened into some form of concrete.