I just sat down with some Mothers Mag & Aluminium polish,an old rag and my Tkat. Wow!! Hardly any effort and all the oxide is gone. Time to scrounge more rags and finish the job. Looks like spring cleaning on the bike is gonna include some aluminium polishing too.
The Mothers Billet was 2x the price and a smaller bottle. Hard to imagine it being better than the mag & aluminium polish for this application.
Thanks for the info on this guys.