The vinegar should not hurt the paint, it is a common solution for helping to remove water spots too. Try to re-hydrate the spots if you can by leaving a wet wash cloth on them for a while.
I do not think it was actually concrete, one of the under layers of a road is this very fine grit, grayish material that when mixed with water does stick and harden like concrete. Had this happen to me a few months back when the road leading to my house was being redone.
I ended up washing the car multiple times, gently scubing the affected areas, then used a clay bar to remove what remained. If I had a pressure washer I probably would have (cautiously) employed that too.
You will want to apply your favorite wax product when your done though.
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kabel
Orlando - 99 BMW M Coupe (autocross toy), '11 Mazdaspeed 3 (dog hauler), '99 10AE Miata (the new daily driver)
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