Have you ever seen the inside of your dishwasher? No, I don't mean where the dishes go. I mean, the guts.
See, this is where you put the detergent.
And this is where the detergent comes out automatically during each wash cycle, which is great for us lazy folks who don't want to have to put detergent in every. single. time., because gah, that would be a hassle.
And if, say, you move to Ohio and don't use your dishwasher for year, apparently the soap hardens in the dispenser and you spend two months wondering why you're having to rewash half the dishes that come out of the dishwasher. But finally you put two and two together.
And have to massage the hardened soap out of the tubes. And yell at your hubby countless times afraid he's going to break something and therefore have to call a real repairman.
But alas, my dishes are clean!