Here ya go....copy and pasted from another forum but by a current member who got the instructions from DaveB himself. Also all rings started as polished and Dave used this method to brush them on demand.
But, straight from the horse's mouth...use a scotchbrite pad, and only do a little bit of scuffing. Also, go around the inside of the ring, not edge to edge. If you go edge to edge, it doesn't look right and the reflections are nuts.