For a situation like this, I use a small buffing wheel on a dremel. I carefully tape the scales with painter's tape so only the tang is exposed and then polish with the pink rouge and the dremel (about an 1/8" - 3/16" wide wheel). This must be done carefully so that you don't burn off the tape and ding the scales, but once you get the hang of it, it's child's play.
I then clean off the leftover residue from the tang with either WD-40 or parts cleaner (for a food service knife I buff it off with a rag - but it takes longer) BEFORE peeling off the tape.
Usually, I tape up the blade and clamp it in a vise so I can have both hands free when doing this (the steadier you are, the easier it will be). If you don't have a dremel, you can get a no name rotary tool pretty cheap at Wal-mart.
Oh, and I use painter's tape because it's low tack and won't leave a residue on the scales (low tack masking tape). Nothing is more aggravating that trying to get adhesive residue off of wood.
Hope it helps,
Nathan