Today’s dishwashers are all “energy efficient” and “water saving”. This logically translates into appliances that don’t work as good as they used to. You have to “prewash” the stuck on stuff and the chunks, but that’s not to say that dishwasher’s don’t work at all, because they certainly do. At least, IMHO.
Yes, even car engine parts, and you can tell my wife. I put a dishwasher in my shop. I got it off a curb during spring clean-up week. Actually I got two figuring at least one was broken. They both work fine.
I also remember the 1960s ones and boy were they terrible! My folks got one and we just never used it, it was easier to just fill the sink with dish water and get-er-done! Three of us would trade off washing, rinsing, and drying. We solved the worlds problems while doing the dishes. Good times!