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Calcium
That is calcium, I had a car brand new-- black.. when I parked in Boston. (same thing happened) almost looks like glazing on a nice doughnut.
Anyway.. dealer wanted to repaint the car, parking garage wanted nothing to do with it.. went to the better garage in boston, they have an onsite detail shop (prudential) the guy said .. stand back and he sprayed this bottle of stuff on my car... waited 2mins.. rinsed.. it came right off.. (must have been a CLR type of solution)
moral of the story.. this is VERY common.. water in parking structures runs thru concrete-- this calcium forms on your car.. (you might have been under a crack in ceiling or pipe)
Parking garage folks know all about this but will deny it.
FYI- and don't ask me how I know--- the following WILL not remove the marks:
WD-40
Nail Polish Remover (aka lacquer thinner)
Mineral spirits
buffing/grit paste or not
Clay bar
gas (unleaded)
Hope this helps!
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