When I first got my A3 i used to wash the wheel with whatever was in my bucket and a Halfrauds wheel cleaning brush. This used to get them fairly sparkly. However, a few weeks back I thought I'd be diligent and took the wheels off, Clean Wheels'd them and then polished them. they looked great for a few weeks but have since become brake dust magnets. The dust just doesn't want to come off as well as it used to. Do the wheels come with a coating which I 've now knackered by Clean Wheelsing them?