Apparently they're clad with a special grade of stainless steel that manages to rust in the rain. Only Elon...
I've heard reports. It could be for various reasons, spotting from metal particles in the atmosphere or discoloration from rain chemical composition.
Tesla have said how to resolve the marks- probably a good polish.
I know you can brush or lightly abrase stainless to remove marks, I've done it on bare titanium bike frame
Edit.
Seems to be airborne particulates causing the spots
Found this also.
View: https://youtu.be/UyaPfDxRjd8?si=2C-G1IVMMds10hlT
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