According to a report from Les Numériques, pre-rinsing dishes before placing them in a dishwasher may not be as helpful as commonly believed. In fact, it could potentially reduce the effectiveness of the detergent enzymes used in dishwashing. These enzymes, such as proteases, amylases, and lipases, are designed to break down proteins, starches, and fats found in food residues. However, they rely on these residues being present on the dishes to function properly. The report explains that these enzymes are less effective on smooth surfaces like porcelain, glass, and stainless steel—common materials used in dishware. Pre-rinsing can remove the food residues that the enzymes need to work with, making it harder for them to perform their cleaning task effectively. This means that even though pre-rinsing might seem like a good idea, it could actually hinder the dishwasher’s ability to clean dishes thoroughly. Modern dishwashers are also equipped with turbidity sensors, which measure the clarity of the water during the washing cycle. If the water is too clear, the dishwasher may adjust its cycle by lowering the water temperature and shortening the washing time. While this may save energy, it could also result in less effective cleaning of the dishes. The article advises against completely skipping the removal of large food residues, however. While pre-rinsing might not be necessary, leaving large pieces of food on dishes can cause clogging in the dishwasher’s filters or piping. This can lead to maintenance issues and potentially reduce the lifespan of the appliance. The key, it seems, is to find a balance between not over-rinsing and not leaving large food particles behind.