As you can see here a very large piece flaked off when I went over it with the pressure washer. The paint only seemed to be held on by corrosion.
The entire driver side under the hood peeled off. The hood was closed when I washed this, but it wasn’t like that last time I opened the hood. My theory is that because this is the primarily south facing side of the truck when parked, is that many freeze thaw cycle over the years caused the paint to bubble up and then peel when the pressure washer sprayed it through gap between the hood and fender.