Thanks for the feedback guys.
It's something on the surface. Not rock chips. If you run your hand across it, you can't feel a thing. Some of if probably is bug splatter that was left too long. However, a bunch of it just showed up since the last time his car was washed. I asked him if he was aware of driving through anything and he wasn't. However, I had to borrow his car today, and I think I may have a clue what it is now.
When I was driving, there was a city street crew with a big truck using some kind of water drilling machinery to embed steel framed reflectors in the center divider on the street. It was leaving a slurry on the road that was apparently water with ground up pavement dust. It was all over the road. The car in front of me was spraying it all over me, and my tires were throwing it everywhere. When I got home there was a gray film all over the car that looked just like that. Fortunately I was able to wash it off immediately. and didn't incur any damage from the incident. So, I'm afraid it may be like a concrete chemical kind of etching or burn, whatever you might call it.
#83 was all I had on hand when I tried to polish it. I need to get some more aggressive polishes. May get some SIP or if you have other recommendations let me know. I have an LC yellow pad too, so don't know if it might help to step up to the yellow pad with #83.