If it's for asphalt, you will need to wash with a solvent base wash (prep sol)
The clay block FF mentioned works great. The guys in our paint shop use it all the time, spraying glass cleaner and rubbing with the bock.
Be very careful if you use acetone or lacquer thinner as you could take the paint off.
Good luck talking to the lawyer route.
The companies who do road repaving have all kinds of loop holes making them not responsible for these types of things!
But it can't hurt to try if you have time to spend of the phone and deal with their run around. routine.
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