[bills1974]

The last couple times I've washed my truck (usually about once a week), I've noticed a bunch of those little "rust spots". When I first saw them, I was worried because I thought it was the paint chipping. Upon closer inspection, I was able to scrape most of it off with my fingernail and whatever was left came off with a little polishing compound.

It's definately a real thing though and I don't know what the long term effects would be if I didn't wash my truck so frequently and they stayed on for awhile.

EDIT: Wanted to add that they're always on the bed usually above and behind the rear wheels.