I was wondering the same thing . . .
about the Westinghouse Laundromat. Although I haven't seen one in person, I don't recall seeing a dispenser anywhere on the machine.
If there is not dispenser, it's not difficult to get the detergent into the machine, as you can add it to the drum at the beginning of the wash, but what about bleach and softener? I can imagine that will be quite a challenge, unless there is a way to stop the machine mid-cycle to add it.
Also, how many rinses do the Laundromats have? Only one, or multiple rinses like the more modern front-loaders?
Anyway, Peter, Toggle's wash-in sounds fun! I have also been invited (hope it still stands), and plan to attend if I can ever get out of here and take a vacation. I saw the pictures from the last wash-in Toggle had, and it looked like fun!
Have a great day all!
Tex