The Washing Machine
As long as people have been wearing clothes, they’ve had to come up with ways to clean them. If you lived a couple of thousand years ago, you’d be beating your clothes on a stone to get the stains out like the Romans did. They had special stone troughs for washing and used rendered animal fat as a crude form of soap. Fast forward a few hundred years, and the stone troughs were replaced with wooden boards for scrubbing. But the process was still slow and backbreaking, and the results were probably less than stellar.