An early example is in Lonesome Ghosts (1937) where Mickey, Donald, and Goofy work for Ajax Ghost Exterminators.

"Lonesome Ghosts" - Mickey Mouse, Donald Duck and Goofy (1937)

Clock Cleaners, first released on October 15, 1937, and Lonesome Ghosts, first released on December 24, 1937, are usually considered the highlights of this series and animated classics.

Lonesome Ghosts (1937)

Lonesome Ghosts is a 1937 Disney animated cartoon, released through RKO Radio Pictures on December 24, 1937.

The Lonesome Ghosts appear as helpers in the video game Disney's Magical Quest 2 Starring Mickey & Minnie.

A scene from Lonesome Ghosts with new music appears in Disney's Magical Mirror Starring Mickey Mouse.

The Lonesome Ghosts appear as Wasteland denizens, and are named Gilbert, Ian, Gabriel and Screechin' Sam.

The Lonesome Ghosts and The Ajax Ghost Exterminators were incorporated into a painting by artist Randy Souders.

Lonesome Ghosts (Pony Canyon edition) (Ghost)