I've found that one of THESE:
...with a bit of Simple green works best for Camaro wheels - it's a toilet swab that I buy at ACE hardware stores -- the 'brush' part is actually a yarn material -- all fuzzy - but allows you to get betwn spokes - behind spokes into the inner wheel - and, in short - makes cleaning your wheels a breeze compared to any other thing I've tried. (short of a high-pressure wash...)
I'm partial to Zaino (Sal is a friend) - but Adams, Meguiars, and Mothers all make great products.
Bro Zeke had spent some time at Milford and also sitting around -- lots of bird droppings (......I think someone at Ford was behind that....
) --
Some Zaino with an orbital buffer took out all the surface dirt and grime - and he looks spectacular (if I must say so myself...)