Like I said ...stupid question...
So it is kind of complicated. I just purchased the car it went in for a inspection and the rear left axle to diff seal was replaced as it was leaking. So before the seal was replaced the issue was a oily Black residue for sure. But tonight it looks like it is a dry black dirt type of issue. But i really did not go that far and the rest of the car is spotless so I am just wondering if the back fascia gets dirty easily or do I have something else going on?