I say keep it dry unless they have been wet already. Well if it has been a while since you wiped them clean, I guess you may need to properly wash them. Then again, if it ahs been a while since you wiped the wheels, then I suppose you should wash the entire car. I have found that normal washing does the job. Remember that post asking "how long do you wait before you wipe the brake dust from your wheels"?

Here is my car a couple of days after a quick clean-up

http://forums.mbworld.org/forums/showthread.php?s=&threadid=52177&perpage=10&pagenumber=1

__________________
I just couldn't give up on my 1995 E320.

I think it might be like always going back to that same bad relationship with an ex girlfriend.
You feel you love them too much, or you are just too stupid to know any better.



Flickr slideshow of my 1995 E320
http://www.flickr.com/photos/24145497@N06/sets/72157616572140057/