Are you trying the "Swifter dusters" on wheels that have some miles driven on them?
Pictures/photos,...please
I get brake dust on my rims every time I take my GT out,....no hard braking .... & I have tried bristle type cleaners/soap/car cleaner, sponges, hands/fingers between the spokes/behind the spokes, & I can see the road grime on the rims, towards the transaxle,..for example. It's like I need chimney cleaner type brush to get inside the wheels. options is to take the wheels off & clean that way?? Sorry, must be thinking show car vs. road car.....wrong thread.......again sorry.. mark