Here's a picture of what is/was on mine. After 3 all day stays at the sucko dealership they finally replaced. It should not have been so hard. Maybe donuts would have help.
The same thing was also on both of my left hand door handles and the rear Chrysler wing. They were also replaced. Bad thing is one of rims is now showing the same thing. It appears as if the rust is in the chrome. It feels very smooth, not as if it is pitting, like it is underneath.