Don't. If it's badly tarnished it's gunna take forever. With buffing wheels to get into the corners I spent about 5 hours on the Prado. Looked fantastic for a couple months. Then tarnished again.Only have painted bullbars now.
I couldn't agree more Dean, we had a plain alloy bar years ago and will never go that way again. Now they are all black, but I guess any painted colour would be ok. A good pressure clean and it's done, no polishing, no special care and no sleepless nights thinking about smudges or bugs.
our bulbar gets used/abused and I see it as an essential piece of gear so I guess having a 'pretty' one doesn't appeal so much. Painted just seems to make sense.