I’ve already heard the argument “they heat up the water far higher than one would when hand washing”, cool whatever. The part I don’t understand is how a dishwasher could ever match the precision of a sentient human when it comes to ensuring it gets every spot. If I’m washing dishes and there’s a hard spot that didn’t initially come off, I put some elbow grease in to make sure I get that spot. Dish washers can’t do that. They can spray every item, but they can’t ensure they hit every spot.
And I don’t want to hear anything about rinsing them before you put them in the dishwasher.
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They’re not more effective, just more efficient. They clean more dishes at once with less water than you’d use to hand wash, and you don’t have to spend your own time doing it. Most dishes come out clean, but occasionally dishwashers miss spots, either because dirt gets caught where a dish is touching something else, or because some dirt was really stuck on and isn’t coming off without elbow grease.
Dishwashers generally don’t heat water any more than whatever temperature it is coming from your water heater. The heating elements in dishwashers are for power drying, if you use that option.
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