Vaseline?
Maine DOT recommends, for dried on water based paint, to coat the affected area with a thick dollop of Vaseline. Let the Vaseline sit for up to 12 hours, then hose off with a high pressure spray. They state any remaining residue can then be cleaned off with a good quality automotive wax.
Vaseline is cheap, might be worth a try! By the way, they recommend this if WD40 fails, as it has in your case......
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