Actually, I recognize the bottle; I saw it at the Alpina dealer - he told me it was acid-based:nixweiss.
The reason I use engine degreaser on really bad wheels is that it cleans everything - not just brake dust: dirt, pitch, tar, grease, etc. In one step you can do what you'd need shampoo/cleaner, clay, wheel cleaner, etc. for - at the same time it removes the filth from tires that have dirt caked on them, and it also cleans the wheel well at the same time. On wheels in good condition, I usually use the 1Z acid based wheel cleaner.