The washers were first available for the 1947 Ford products as a dealer installed option. The nozzles were mounted on the top of the cowl next to the wiper base. Exact location varied with dealership. There was a button under the dash near the steering column (again location could vary). Pressing the button allowed engine vacuum to suck up washer fluid and at the same time compress a spring, that when released pushed the fluid through rubber tubes to the nozzles. It was just a one shot blast of fluid and the button needed to be pressed again.
