Back a couple years ago the car guys answered a question about how to remove concrete from a car’s painted surface without damaging the paint. Can anyone remember what chemical they recommended? I believe it was an acid.
Muriatic Acid
Tester
Google, “concrete remover”. It’s out there. I’ve found it before.
Here is one product for concrete on car paint: http://www.topoftheline.com/cement-concrete-remover-auto.html