To be fair
One does own a posser in form of C.T. Childs "Rapidwasher"
https://www.readymaderesources.com/product/rapid-washer-aka-yukon-plunger-free-shipping/
https://www.lehmans.com/product/rapid-laundry-washer
And am here to tell you the thing is amazingly effective.
Don't quite go at it like women in film (though if one is ticked off about something it is a very effective way to work out anger while getting washing done....) , but the thing works though a tub of washing faster than anything else one knows.
Often if have a load of linens that don't want to wait ages to do in the Miele or AEG (too many for one load, or a small load that would cause out of balance issues), will just bung the lot into wash tub and get out the posser.
Five minutes washing, several rinses later the lot is bunged into spin dryer. Can get though six sheets and twelve pillow slips in under 45 minutes. That is everything washed, rinsed and on the clothes horse.
Back on topic; would love to see the goings on when say one wife noticed her husband's/bf's shirt, hanky or other article of clothing in some other woman's wash.
Phrase "it all comes out in the wash" derives from secrets told by dirty laundry. That and when things that ought not to be in someone's bundle, well are. *LOL*
I mean if you're a widow or single woman and a man's drawers or other article of clothing is in your wash.....
This or some housewife is sorting out her washing in public and her man's shirt has a lipstick mark that all the others recognize isn't her shade.
Another well known phrase comes out of all this; airing one's dirty linen in public.