I don't know the Sonax product, but having tried six or seven different wheel cleaning products locally, the BMW gel worked as well or better than any I have tried. My wheels have been as black as the photos above after a winter, and I used only a rag and the cleaner (two or three full iterations) to get them that clean.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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