I've done some things but this particular job I let my buddy do cause he's great at it. He used a bench grinder with buffing wheels on it. The cranks had Some sort of silver anodize on them the same way the Sugino 75s and Dura Ace FC 7600 cranks do. So with a cotton wheel and black rouge he removed that coating. Then used brown rouge. And finished off with white rouge on a flannel wheel. About two hours worth of work.