Just did this yesterday (in between hospital trips, etc).  Got all of the
brake dust off with dish soap and a dish washing Scotchbrite pad.  Didn't
seem to scratch the paint at all.

Thanks,
Ken Wilford
http://www.vanagain.com
John 3:16
Office (856)-765-1583
Shop (856)-327-0027
Fax   (856)-327-2242