I had missed this spot while cleaning. Thankfully it was a good opportunity to take a photo to show how much dirt and exhaust soot was actually built up on this bumper. Yes the whole bumper looked like that.
Before and after of my brothers honda. His rear bumper was completely covered in exhaust soot it was off white for a few years. Until I saw he tried removing it with the rough side of an SOS pad so I chewed him out and told him I'd clean it for free lol. You can see how much soot was on there on one
I use my f350 haven't gotten a cover for it yet so I don't store anything what a pain because I live on the third floor lol. I was considering a van or a trailer but idk I'm not sure which way I'm going with my business yet.