How do I remove spots and filming from glasses and flatware?

To remove stubborn spots from glassware, remove all metal utensils, do not add detergent, select the longest cycle, and start the dishwasher. After 18 to 22 minutes when it is in the main wash, open the door and pour 2 cups (500 ml) of white vinegar into the bottom, then close the door and allow the cycle to complete. If the vinegar rinse doesn't work, repeat the process using 1/4 cup (60 ml) of citric acid crystals instead of vinegar. (Page 21)