How do I remove spots and film from dishes caused by hard water?

To remove spots and film, try a white vinegar rinse by placing 2 cups (500 mL) of white vinegar in a glass or dishwasher-safe measuring cup on the bottom rack, then running a complete washing cycle using an air-dry or energy-saving dry option without detergent. Note that this procedure is intended for occasional use only, as vinegar is an acid and using it too often could damage your dishwasher. (Page 20)