Cleaning continues. I used some dishwashing soap and water in a bucket and sloshed it all around the wheelwels with a soft carwash brush. Got most of the road dust off. I then used the diesel-damp rag to wipe everything down including the frame rails. It seems like the assembly line used a bit more black-out paint on the passenger side than the driver's side. Looks like they were just trying to cover the white frame rails and a bit of the wheelwells. By the amount of non-coverage on areas shaded by things like the lower lip of the inner wheelhouse and the sway bar bracket, you can deduce that they didn't move the paint gun around much and just blasted it from one position.
I also pulled the brake drums and gave them a quick dip in the evaporust which removed the surface rust immediately (once it was warmed up to 70 degrees in the sun). They look asssembly line fresh now.
