Andy the OP had a question that I was trying to answer. For me, the tire has been changed since the top photo and everything realigned. The staining as you called it is mud, you can see water everywhere and I had not finished wiping it down.

I currently am working on other projects and had the car in the air so I took the photo of the belt to tire clearance.


The light at the end of the tunnel is actually a train. 2019 M3W