[marstang]

Yes, try white vinegar. I used to call on a Limestone Quarry. The wet lime would cake to the wheelwells, and dust would adhere to the finish. As strange as it sounds, white vinegar removed it. My contact at the quarry kind of laughed (like it was a dumb question) and gave me the suggestion when I asked about it. One of the car washes near my home, next to a quarry, has a white vinegar dispenser in the bays. Try it, it's worth a shot. Good Luck!

Marty