Looks like its white paint and should buff right out.
It looks like you just need a mirror cap from the picture.
I would replace them with the OEM CF ones.
Best price I found on ebay
http://www.ebay.com/itm/BMW-OEM-M-Pe...9cb5d2&vxp=mtr
or you could buy these and repaint them
http://www.ebay.com/itm/bmw-328i-sid...67e6e8&vxp=mtr
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23 G42 230i Mineral White Cognac, Aluminum With Mesh Effect Interior Trim MODS Clear Guard, 15% Ceramic Tint, Floating Caps