You could just hit the lights and sirens and drive fast to air dry <img src="images/graemlins/smile.gif" alt="" />
It was above 10 degrees yesterday so we took both vehicles to a working car wash and got a lot of the salt and crap off the underside. Parked both in the sun and towel dried most of the door and window openings to keep them from freezing up. Didn't even bother to use any soap on the body, just wanted to spray the salt off, my truck is already showing some surface rust in spots underneath.