simple green works great for cleaning, spray on wipe off!

 

RejeX is a pain to put on and then did not really seem to make any difference. IMO, the sprays on products are not really worth the effort either. I bought a detailing brush which I keep in the Cayenne and I stop at a "do it yourself" car wash once a week to wash just the wheels. I spray the wheels with "high pressure soap", use the brush on them while I am spraying, then rinse. Takes about 10 minutes total at the most, requires little effort and cost about $3-4. If there is bird crap, etc. I spray it off as well (gently), but generally hand wash the car myself.