The film is from the water itself. Nothing to do with any filter or rinse agent. The root cause is the change in detergent formulation years ago. Government removed TSP. But... you can still buy that yourself. Buy some, and add about a teaspoon now and then with the wash. It will clean the residue and the inside of the dishwasher will be spotless. The rinse agent will work properly for a while.
Disclaimer: TSP will cause plant growth (algae) in ponds. That is the main reason it was excluded from dishwasher, and regular dish soaps.
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