In the Big Bang Theory episode after Howard's mother has died and they are trying to sort & sell off the excess stuff from the house, they are outside the garage and, in a few shots, you can see the almond version of this style of machines in the laundry room. Howard's mother washed a lot. I doubt that he would know how to use them; he was too spoiled. He would not even do laundry in coin op machines which was the topic of another episode.