Now looking for an effortless way I came across the NIGRIN cleaner. At first I was skeptical that some chemicals can replace the tedious cleaning? Straight forward sits on silver rims black brake dust, is the difficult to deal with. But the product convinced.
Rims in the car wash spray, leave accordingly, not be irritated by the color change of the foam and then spraying with the radiator. The result is indeed not entirely new wheels, but at least even in small angles again sizable Alus with whom you dare back on the road. At one point or another I had briefly again clean with a rag or brush, but that's negligible unlike before. I was fully convinced of the cleaners!