Works in Progress Podcast Washer woman: The invention of dishwashers
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May 1, 2026 A lively tour of how scouring sand, wood ash and early soaps evolved into mechanized dishwashing. Stories of 19th-century crank-and-tub contraptions lead to Josephine Cochrane’s pressurized-water breakthrough. The narrative traces electrification, infrastructure and market forces that made dishwashers common. It ends with data on how the machine changed household labor and saved water and energy.
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Coal Shift Pushed Soap And Hot Water Dishwashing
- Dishwashing shifted from abrasive scrubbing to soap-and-hot-water as households moved from wood to coal heating.
- Coal reduced wood ash (lye source), so ready-made soap plus hot water became necessary and reshaped kitchen cleaning routines.
From Hand Cranks To Cochrane's Water Jets
- Early dishwasher inventors relied on hand-cranked tubs, paddles, and spinning racks that sprayed water but still needed manual scrubbing.
- Josephine Cochrane later commercialised pressurised water jets and patented dual soapy-and-rinse systems that worked better.
Cochrane Sold To Hotels Before Households
- Cochrane built a factory near Chicago and demonstrated machines at the 1893 World's Fair, but hotels and restaurants became her main customers.
- Household adoption lagged due to cost, limited electricity, and lack of piped hot water in many homes.
