White Residue (Photo)
Discussion
Do you have a close up - difficult to tell from that resolution. It’s likely to either be water deposits as when you wash the car it gathers in the grill then dries. It will leave marks and especially in a hard water area. I always use a leaf blower to get rid of it after a wash. Or if a corrosive shampoo has been used it could do that but I expect that would have eaten your paint first! The worst case, that black grill is known for the paint corroding - as it gets v hot. These can be easily removed and power coated in expensively at a wheel place.
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