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My suggestion,
Optimum Power Clean 3/1 or more diluted(or another APC that is safe on your rims), Daytona speed brush for inside the rim(has saved me so many bloody knuckles), regular wash mitt outside the rim.
1. Sonax FE won't remove dirt? What?
2. But, you thought touchless washing with a pressure washer would remove it?
3. Your cleaning dirt off a wheel with a Power Ball attached to a drill?
The way to clean wheels completely is to:
1. Hose them or pressure wash them down.
2. Spray them with wheel cleaner.
3. Agitate with wheel tools/brushes/etc..
4. Rinse wheels.
That's the only way the wheel is going to get factory clean. Sonax FE agitated with brushes on a wheel should remove any traffic film you can wipe off with your finger. This I am not understanding. How could it come off with said finger - but not come off with wheel cleaners and agitation ???? - as you said Sonax FE left dirt behind...
Are you just spraying the wheels, not touching them - and expecting them to be 100% clean? That can not happen.
They make special tools to clean wheels. You have to use them to agitate the dirty wheel - then rinse - to get it clean.
That looks like a good product. What size did you go with?
sometimes you have to touch the paint/wheels to get them perfectly clean as even a pressure washer can't remove a film left behind...