If you are interested, at least a bit, in a history of the technique you must look here! Lee Maxwell Museum of Washing Machines is an incredible set of washing machines old, restored, still in working order. From brought up by hand ones up to machines with the mechanical propulsion. If you watch the first film until the end, at the end you will see apparatus for the hot permanent waving :-). Link to the Museum website - here.
I na koniec jeszcze dwa krótkie filmiki prezentujące pralki Maytag z napędem spalinowym. Ciekawe czy rurę wydechową montowano do pionu wentylacyjnego czy po prostu wystawiano za okno?
And for the end two brief films presenting Maytag washing machines powered by gasoline or petrol engines. Its interesting whether an exhaust pipe was being assembled to the vent stack or it was simply taking out behind the window?