Spots and film form in your dishwasher's rinse cycle, when detergents are already down the drain. Finish Jet-Dry Rinse Aid works in the rinse cycle, lowering the surface tension of water and causing it to sheet. Better rinsing results in less spots and film! For optimal results, use with your detergents. It works with your dishwashing detergent to rinse away stubborn leftover food, spots, and film for sparkling dishes, glasses and utensils. It's easy to use as well! Simply fill your rinse aid dispenser with Finish Jet-Dry Rinse Aid and it will be automatically released in the rinse cycle every time your dishwasher runs.