Dishwasher

3.  A Word About Prerinsing

Don’t do it. Yes, you read that correctly—prerinsing is wrong. “Dishes should be scraped to remove large chunks,” says Dries. “But if you’re rinsing, you’re really just wasting water and electricity.”

So why is everyone in the habit of prerinsing? Because older dishwashers removed food soil by diluting the food in water, and then hoping it went down the drain. Which it often didn’t.

The vast majority of today’s models have filtration systems designed to catch food and pump it down the drain so that very little dirty water carries over to the next cycle. Higher-end models not only have self-cleaning filters, but hard food disposers as well, which grind food and send it down the drain.

In addition, modern detergents are designed to attack food, which can actually cause problems if there isn’t any food on the dishware. “The detergent in the unit aggressively goes after something, and if you don’t have food soil in the unit, it attacks the glasses, which will get cloudy,” says Mike Edwards, a dishwasher designer and senior engineer for Bosch. So ignore your friends when they tell you that you have to prerinse.