Got out the dawn and toothbrush today, and it cleaned up pretty well. There is some yellowish, plaque like substance on the bottom. Not much at all, but not coming up with just soap. Is there an in between step between the soap and the polish? And what about disinfectant? An alcohol rubdown ok? Finally, I’m really tempted to try the blade that was in it when I found it. Again, not used for at least 40 years. It looks fine (I cleaned it). any objections?