I have not used it myself. But the product has been stuck in my mind LOL. Mothers R3 Racing Rubber Remover. That could be an option maybe. But you maybe need it in a gallon LOL.
Is the wheel wells painted without any underbody spray? Then a tar remover would work I think. We have something called Cold Degreaser that is based on petroleum of some kind. Kerosene or painters thinner or mineral spirits. Used on the rims it desolves both tar and rubber and that residue from brake pads. One that would definitely desolve it would be 3M general purpose adisive cleaner. They have the spray can here on AGO but there is in bulk too.
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