For rust right on the edge of the blade, a light stropping will work to take it off. Will probably make your edge just a touch sharper too <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
But seriously, your best bet is to just use the sucker! Chop something, baton some logs, put some scratches in that pretty CG coating. <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />