How do I remove spots and filming from glassware?

Remove all metal utensils from the dishwasher and do not add detergent. Select POTSCRUBBER cycle and start the dishwasher for 15-20 minutes into the main wash. Then open the door and pour 2 cups of white vinegar into the bottom. Close the door and allow the cycle to complete. If vinegar doesn't work, repeat using 1/4 cup of citric acid crystals instead.