I washed my S3 yesterday and noticed some heavy pitting / what looks like rust on the mirror caps. Has anyone else had this issue, rest of the car looks fine.
Looks like a combination or stone chips and bonded contaminants. The matte finish is also bad for contaminants bonding.
I would try something like carpro trix as that will remove iron and tar deposits.
Is that chrome mirror caps? If so, try a little metal polish. It looks like what you get on a chrome exhaust, salt can cause it so if not been cleaned throughout winter.
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