This is definitely not rust, or marks that will wipe or polish away. The issue noted above could be the hubs themselves, as they are raw/un-coated steel and are always 'rusty'. Image hosting sites are blocked through our firewall at work...otherwise I'd share photos.
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2014 BMW X5 xDrive 35d M Sport Mineral White
2011 BMW 135i M Sport Space Grey
2007 Suzuki GSX-R 750
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