Well, the usual result is that your car looks like you let water dry on it. You know those sort of chalky spots on the paint when it dries? Like that, except permanent as it is etched into your clearcoat.
Polishing wax, detailing clay, and a VERY CAREFUL buffing might help. Worst case scenario is a re-clear on the car. As a total all over paint job will cost you well less than $6k ($4k here locally for a really nice, but not show-winning, job), a re-clear wouldn't be that much.
The shop I write for does acid rain stuff with some regularity. Usually you see the upper surfaces of the car affected. Very easy to deal with normally.
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