POCATELLO — The Museum of Clean in Pocatello recently added a dog treadmill-powered washing machine from the late 1800s to its growing collection of more than 5,000 cleaning antiques. The washing ...

(Forrest Czarnecki/The Gazette) A model of a washing machine that operates on gravity, human strength and ingenuity sits on the shelf in Lee Maxwell’s washing machine museum in Eaton, Colorado.

Upon retiring as a Colorado State University professor in 1985, Maxwell and his wife, Barbara, made a chance stop at an auction in Iowa on their way to Maine for vacation. They came home with 13 ...