Your dishwasher probably has a reservoir for holding this product. Many dishwashers also let you adjust how much will be used each cycle. You should set the adjustment to use as little as possible. If you see spots on your glasses, increase the setting until you have satisfactory results.
Finish® Jet Dry Dishwasher Rinse Aid works with your dishwashing detergent to rinse away stubborn leftover food, spots, and film for sparkling dishes, glasses and utensils. It is not formulated for the dryer.