Rinse aids are liquid solutions used in dishwashers to improve the drying process of dishes and glassware. They work by reducing the surface tension of water, allowing it to spread and drain off more easily. This helps prevent water spots and streaks, resulting in cleaner and shinier dishes after washing. Typically, rinse aids are dispensed automatically during the rinse cycle of a dishwasher. They are especially beneficial for items made of glass, as they enhance clarity and shine. Many brands of rinse aids are available, and they can be found in most grocery stores alongside other dishwasher products like detergents and cleaners.