S&W probably would not refinish grips. There are several expert stock refinishers/restorers who can make wood grip panels look like new again, even badly damaged ones. However, that will cost $80-$100. However, if the only damage is to the finish, and there are no serious gouges, dents, chips missing, etc., you might want to refinish them yourself with one of the gunstock oil finishes on the market, like Birchwood Casey Tru-Oil. Another brand is Linspeed. My favorite is one of the tung oil finishes for wood furniture, available under several labels. If you use Tru-Oil, etc., it helps to dilute it a little with mineral spirits. Before refinishing, make sure you clean the existing finish well with mineral spirits first and go over it with 0000 steel wool. If you want to remove the existing finish, use Acetone.