All I can saw is WOW.
I recently picked up a used set of Brembos - 8 piston/4 and the owner was not really the detailing type. High Performance pads = dust.
I spent a little bit over 2 hrs with
APC 4:1 - 2X, then followed up with P21S gel, soak, agitate, soak, agitate and rinse. It still was not getting them to the point where I wanted them. While the majority of the dust was gone, the underside ~sweep~ of the caliper, etc had dust that would not budge. Areas by the bleed valve, etc had remnanats.
Steamer took all that brake dust if not misc assorted areas in less than 20 minutes for all 4 calipers. All I can saw is WOW. I've used it on the interior, love using it to really clean my wood floors (literally get's slippery once I use the steam cleaner) but today, I now realize the efficiency of a steam cleaner for a pro detailer ! I can imagine wonders on Pcar wheels, typical BMW multi spoke wheel, etc where instead of chemicals, you can just steam clean away !