They don't want you to know
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To show what a dishwasher does, they built one with a large window on the side for childrens television ("Sendung mit der Maus", German public TV Station ARD). Quite interesting and informative.
I guess you mean this one? https://www.youtube.com/watch?v=e2X-gwfX4aA
Bonus video: Your dishwasher is better than you think
Exactly that one. Thanks.