I have a couple old Comoys, that are 65 and 85 years old, respectively. They are pristine and I keep them that way with the exception of oxidation inside the vulcanite stems. I clean them out with cleaners and everclear until the cleaners come out clean, but still get echoes of the oxidized rubber taste from time to time. Any good solution to get rid of the taste, and prevent it from coming back every couple months? Thanks!