Today my Aunt graciously gifted me my Uncle's long-handled 1976 Gillette Super Adjustable. Man, I'm really liking it. Can't wait to see how she shaves. Before I go and possibly break it I'd like to know if there's anything special I should know before operating this razor? Do I turn the settings dial with the doors open or closed or does it matter? Can I drop the whole thing into boiling water without damaging handle or should I use a cleaner like Barbicide? What about lubrication for the handle or doors? Thanks.