So like most everyone else on here, ive had to switch to the new blue wheel cleaner. I had a lot of the pink gallons so i used those up and switched to blue towards the end of last year, since doing so my wheels have now been developing deposits of brake dust inside the barrels from rotor evacuation and in the corners of the spokes from rotation. Granted i run aggressive pads on track that dust heavily, ive never had this issue with the pink stuff and now i cant get it off of the wheels. Ive let it soak in the corners and gone at it with brushes, tooth brushes etc.
The before picture is average dust coverage, the after picture is after a full cleaning with scrubbing in the corners and barrels.