[...]The laundromat I've used over on Rose Hill Drive doesn't take cash in the washers and dryers themselves. Instead, you buy a card from a vending machine and you use that card to pay for the machines, and you add more money to the same card when it runs low.[...]
That's the sort of system we've had in the apartment block I reside in. Before that we had an odd system called 'tokettes' in which one would buy little green plastic pieces which one would stick in the tray and push in.