I used BMW wheel cleaner ,which seems to be the same product as Sonax on two sets of wheels and got poor results and yellow stains .

I tried comparison with Auto Glym wheel cleaner by cleaning one front wheel and one rear wheel from a Mini with Auto Glym and one front wheel and one rear wheel with BMW wheel cleaner .I cleaned the inner part of rims as they had years of baked on dust .
The Auto Glym cleaner required 30 seconds of brushing to get the wheels almost spotless using a soft brush whilst the BMW cleaner required a few minutes of brushing to get the rims only semi clean .
I was amazed at how easily the wheels cleaned up using Auto Glym .