Home / Forums / Melodica construction, repair and maintenance / Give your melodica a bath! / Reply To: Give your melodica a bath! Reply To: Give your melodica a bath! May 3, 2018 at 4:39 am #9841 Alan BrintonParticipant I’m not sure about the output jack, but usually it is older melodicas, especially vintage models that need a bath. Your ten year old Pro 37 could possibly benefit from one if keys are sticky, for example, but it’s not likely that the Hammond would need it in the foreseeable future.