I inherited my Centenial Featherweight from GM to mother to me. The machine had been stored for years and the case was very musty. I did the newspaper thing, outdoor sun, dryer sheets and finally Fabreeze. THe fabreeze did the best job but not all the smell is gone. I don't store the machine in the case anymore. Also I leave the case opened all the time and give it a couple of shots of Fabreeze about once a week. It helps but don't think anything will really work except ripping out the case lining which I may do and reline it. I know, I know, don't change an antique. It will destroy its top value but I don't plan on selling it.