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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It’s the same reason power washing your deck is more effective than hand scrubbing it. While you can pinpoint a spot with hand scrubbing, it takes time. Modern dishwashers and detergents can do an equal job at spots with less human energy. That time savings is efficient for said human. The dishwasher doesn’t need laser vision as it hits every area with hot, soapy water at high velocity. Water has a lot of mass, so this indiscriminate force is typically more than the spot can handle. On the off chance it can’t handle the spot, you are hand washing one spot on one dish and not all parts of all dishes. Plus, hand washing uses dirty water to clean dishes.
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