You can start and end with the Mother's Mag polish and some elbow grease -- anything more abrasive will just cause scratching and frosting you'll have to polish out later.
If you sand it, you'll be increasing the brush; to bring brush to mirror shine, you need a polish that it with slightly less aggressive than the media used to create the brushed look, then use increasingly finer polish from there.So you don't have to sand the brush out of the ss