Exhaust stains on rear valence 70 and later cars

Dartswinger70 said

So it seems a pretty common thing ? no carb tweaking etc? I suppose if it is "normal" I will embrace it as part of the "old Mopar mystique" :)

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My car is new so I haven't had that happen yet. I have to re clear the valence this winter as I have some bodywork to do on one corner (doesn't fit the quarter properly) so I'll think about putting some old Turtlewax on it once that is done.