I agree with the previous poster; it sounds like hard water residue. Use vinegar to get rid of it. I used to put a cup of vinegar in the last rinse. You could also try different detergents. There may be a different kind that works better.
Fill dishwasher with residue dishes. Pour 1 cup white vinegar into the bottom of the dishwasher and run a normal wash cycle. The vinegar naturally dissolves any hard-water residue or film without harming the dishwasher or dishes. Add the vinegar to the dishwasher cycle every three runs or so, as needed to combat white residue. If you have severe hard-water issues, use the vinegar every time you run the dishwasher, especially when washing glassware.
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