I was at the local Bed Bath and Beyond and found the perfect brush for cleaning the wheels on my Crossfire.
This thing is similar to other wheel cleaning brushes, just a little stiffer bristle and it's 28 inches long.
I bent mine in half and it's just perfect for getting inside those deep rear wheels. Following is a link:

http://www.casabella.com/Merchant2/m...Category_Code=