For those old enough to remember the movie, "The Ghost and Mr. Chicken" (with Don Knotts) they talk about using Bon Ami to try and remove bloodstains from the keys of an organ. I don't know why that stuck in my head.
https://www.imdb.com/title/tt0059221/characters/nm0922851
My mother took me and my brother to the drive in to watch that movie.