Probably too late, but I use the Autoglym product. As mentioned it's easy to apply as it's an aerosol. I use it really generously twice a year when I change from summer to winter wheels. I don't wash my car very often and the wheels, esp the front, get really covered in brake dust. Having used Autoglym they are a complete doddle to clean. A spnge and a bucket of car shampoo and the grime just washes off. No hassle at all.