Help removing White Road Paint on my X

[NoCoX5]

Had a pleasant trip into work this morning but when I got out of my X and noticed the entire passenger side (Doors, wheel wells, front and rear bumpers) were caked with white road pant from the new lines painted on the road, I was was a bit pissed. I made a valiant effort to avoid running over the lines, but still payed the price. Any ideas on how to get this crap off my beauty? Took it to a self-service car wash and attacked it with a high pressure hose and scrubbed the heck out it with the scrub brush, but that stuff is pretty resilient.