The road tar around these parts is like epoxy.
Propane torch and putty knife here on those behind the wheel panels. I think the Texas hot topping cocktail is king of the hill! Solvent removal? Shi..........
Seriously though, most road tars are oil based. And are dissolved with some type of hydrocarbon solvent. WD40 is mostly mineral spirits which is why it works well. And what they changed on it was switching the propellant from propane to carbon dioxide. Thank Al Gore!
Anyway, most solvents also remove waxes.
So there's going to be a balance between how well your remover is going to work, and if there's a follow up step like re-waxing.
I'd rather have the tar come right off with a quick wipe, and slap a quick coat of wax back on, than scrub and scratch the paint with some crap that don't work.