How to get rid of sun spots?

[YAR1S]

I had the upper part of my bra on my car like this:


and today I took it off and washed it and there are huge patches of lighter paint that appears to have been faded or burnt or something?
I had washed it once at a car wash with the bra on, so maybe some soap has gotten under there and faded the paint or left a bad residue???
It has also been very cold and icy here so maybe some ice got under there and froze the paint? (LOL)

I also went to autozone and they said it was the black bra heating up in the sun that caused the spots.

I have tried one coat of turtle wax and no luck.

I just dont understand.... I had this bra on there for a whole summer and this is the first time that this has happened to me???? :(