Whilst stopping at some red lights yesterday I noticed that the white Honda Odyssey parked in front of me had one of the worst cases of exhust fume staining I have ever seen on a vehicle.
Those black marks would just wipe off with X-Clean Xtreme Clean. I’ve even written instructions for how to remove exhaust staining with X-Clean Xtreme Clean
So if you recognise those marks as belonging to your car, you should buy some Xtreme Clean.