Grips off, cylinder out, drop all metal parts in HOT soapy water then scrub barrel and cylinder chambers out with piece of flexible nylon rod with scotch brite super glued to it. Remove nipples and clean them and the cylinder with an old tooth brush. Dry with a hair dryer. Refit nipples after smearing grease on the threads, grease cylinder pin and refit cylinder. Spray wd40 into barrel, cylinder chambers and pistol action ect, Refit grips, job done.