For those of you who can't get your wheels clean enough try this method:
Spray on Mothers Tire and Wheel Cleaner, let stand for a minute then scrub the green long handle
dish washing brush then rinse with a hose. To get in the smaller vents spray the holes and scrub
with the small wooden handle stainless steel brush, then rinse.
It takes more time to get in the small holes but it's worth it.
See the photos and note the one vent at the bottom that is cleaner. Mothers is the best I've ever used.