The automatic dishwasher is the most energy- and water-efficient way to wash dishes whenever you wash a full load. But did you know that pre-rinsing plates and utensils isn't just a waste of water, but it can actually harm your glassware? Modern dishwashers and dishwashing tablets are designed to work with soiled plates. The detergents are activated by grease and work well to get everything clean. When items are pre-rinsed, the detergents don't have enough to work with and attack the top-rack glassware, making them scratchy and damaged. So just scrape food into the trash and let your dishwasher do its magic.