Man had not invented ... dishwashers
Men still haven't: the inventor was a woman -- in 1886, well before grandpa was born.

The invention was at first not very popular, but not for a reason one might readily guess. At the time, the life of a typical housewife was so physically backbreaking that she rather looked forward to the chore of washing the dishes, as a respite. She had no desire to avoid that chore! Hence, originally the invention was well-received only by hotels, restaurants, and families sufficiently well off to have servants for the household chores. Indeed, the inventor's original incentive to devise a dishwasher was to mimimize the amount of crystal broken by her servants.