I would assume he hit something.....like a yellow pole and the paint transferred from the pole to the bumper.
It often grinds into the paint and "becomes one" with the factory paint.
It can be VERY difficult to remove (without removing copious amounts of factory paint)
My first thought was a little mineral spirits on a rag. Don't do this unless someone chimes in on this thread and agrees. That is just my thought but I want to get some other opinions if they think that will hurt the MO paint or not. I think I'd first try some over the counter auto products on the shelf. Be careful about compounding as the "old style" compound will strip the clear coat off. Make sure you use something that says its safe on clear coat.
Just how many things do you guys go around hitting?
I've done it exactly once in 40 years.
Tried to get it off using a polish (no) then compound (sorta yes, but it took off the factory paint too) and finally took it to a pro who sanded it off and repainted the bumper.
One of the reasons why i like the idea of a RV camera.
The pole I hit was too low to see.
It was "protecting" a big pole that I could see.
PO'd me at the time.
People hit me Homer. Door dings were the primary ones that left paint. Also, yes, the wifey turned a little close to a yellow pole.
Yes it is safe. It takes carwash micro scratches out of the clear coat without removing it. You can buy it anywhere like pep boys, autozone etc. I surely wouldn't want to put mineral spirits on there, ack! Just put scratch out on a microfiber towel and rub in circles. It will haze up. Then you buff it off.