I visited this hotel last year and asked around after the cleaned coins. The first few staff members I asked had no idea what I was talking about - but they found me a more tenured member of staff and he told me that they don't do this any more. Which is sad, because I wanted some shiny pennies!
He probably retired and that was the end of it. A law firm near where I worked had an elderly lady who worked as an elevator operator up until a couple of years ago. Once she retired, the elevator was set to modern operation. They could have switched over long ago but kept her as the elevator operator, likely because she had been there so long and in the big scheme of things it didn't cost much. Might have been the same with the Westin St. Francis who long ago no longer really needed a coin cleaner but he was part of their connection to their past and didn't cost very much to keep around. Once he was gone though, there was little reason to get a replacement.