pre-rinsing dishes before loading them into the dishwasher was a common practice. However, it is generally not necessary with modern dishwashers and detergents.
Most dishwashers today are designed to handle food particles and debris on dishes. They are equipped with powerful jets of water, multiple wash cycles, and effective detergents that can effectively clean dirty dishes. In fact, pre-rinsing can sometimes be counterproductive, as it removes some of the food particles that the dishwasher's sensors use to determine the soil level and adjust the cleaning cycle accordingly.
However, it is important to note that heavily soiled dishes, such as those with large amounts of dried-on or burnt food, may still require some pre-rinsing or scraping to ensure optimal cleaning results. Additionally, items like pots and pans with sticky or greasy residue may benefit from a quick rinse to remove excess grease.
It's always a good idea to check the manufacturer's guidelines for your specific dishwasher model, as some may have recommendations or requirements regarding pre-rinsing. If in doubt, you can do a trial run by loading a few lightly soiled dishes without pre-rinsing and see if your dishwasher effectively cleans them.