About 40 bucks
Seriously, I've never used bleach. I've just let them soak for an extended period of time (12 or more hours) using a bit more good laundy soap than normal. This has worked on the black belt stains that you're talking about. If after you've tried this they still don't look clean, don't let them dry. Resoak them again. Good luck!
[Edited by Patton on Sep 22nd, 2005 at 12:15 AM]