Ed , make a shallow pool big enough to submerge the roof in and fill it with evaporust and put the car on your rotisserie ...
Let's see, 6 feet wide, probably close to 8 feet long due to the slope of the rear pillars, and at least 8 inches deep because of the curvature of the roof. That's 32 cubic feet of evaporust OR 239 gallons. That's gonna cost !!
