The first dishwasher was invented in the USA in 1857 by Josephine Cochrane (trust a woman to realise the value of such an invention).
The first dishwasher in Europe was invented by Miele in 1929, but they did not become commercially popular in Britain until the 1950’s and only for the wealthy at that time.
Advert which appeared in the Bromley & Kentish Times, 12th July 1940, page 2