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You can remove a soap film left on glassware in a dishwasher by rinsing them with vinegar. If this is a continuous problem for you, you may want to add a half cup of vinegar the next time you wash the dishes. This will remove soap scum from both the dishes and the inside of your dishwasher. You may also want to try using less detergent than recommended if your water is soft, which is often the cause of soap residue.
THANKS FOR THE TIP. I NEEDED IT.
Haven't tried it yet but I'll bet it works.
I'm heading to the kitchen right now.
Also, with the vinegar, make sure the hot water has been running in the tap until hot. Cold water in the dishwasher acts like a cement for soap scum and film.
I also use a rinse aid that is in the dishwasher for up to a month. It works well.