Thanks for all your comments, tips and advice!
I did put some wheel sealant waxy type stuff on them when I got them and before the tyres got fitted, i.e. straight outta the box on the MINI, but not on our other cars.
Seems to have lasted ok, but will have a look and see what I can find, based on your advice! :-)
I'm not the most diligent of cleaners when it comes to wheels, especially on the Audis, so probably time to start!


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