Dan's right; the only way I know to get it back to HI factory default is with a spiral sewn buff with Tripoli compound and a lot of polishing. Which I think is why you see so many of Dan's knives, esp. the HI conversions he does, with beautiful and functional satin finishes.
I keep mine nice and shiny, but once they get scratched up, they get a scotch-brite satin finish. It holds oil better anyway, and looks great.
Norm
Addendum: I realize this is technically incorrect. I use tripoli and a spiral buff all the time because it polishes wood, horn and brass, and shines up the steel. But for scratches or heavy scuffs though you are better served with white rouge on a loose or maybe a canton flannel buff. In any case, as I said I seldom use them as I prefer the satin finish...