Today I found and bought a 4" 66-2. It came with S&W target grips that look to be original. They are dated June 15, 1984. They are dirty with a dull hazy finish. How to best clean them so as to remove the filth and retain the original finish? I have turpentine, acetone, mineral spirits and Formby's Furniture Refinisher on hand. Suggestions, information, etc. will be appreciated. I do not want to mess these grips up as they are very nicely fitted and exhibit a striking grain pattern. Sincerely. brucev.