The best thing I have found for cleaning all parts of the marker is rubbing alchohol. It cuts through old paint and dirt and drys almost instantly.
__________________ Proud Member of THE URBAN GUARD "A people that values its privileges above its principles soon loses both."
-- Dwight D. Eisenhower
"Associate with men of good quality if you esteem your own reputation; for it is better to be alone than in bad company."
-- George Washington Feedback