See also: 1937’s Lonesome Ghosts, notable because Mickey, Goofy and Donald are running a ghost extermination company that, I’m fairly convinced, had to be a major inspiration for Ghostbusters. At one point Goofy even says “I ain’t afraid of no ghosts.”
It also ends with the victorious ghost hunters covered with sticky white goo. I wonder if anyone has done a video mashup of the two films yet.