This could be related to the fact that the phosphates are greatly reduced or being taken completely out of automatic dishwashing detergent.
You could be buying a reduced phosphate dishwashing detergent inadvertently.
I have to go to Idaho and sneak my dishwashing detergent back into Washington if I want phosphates and clean dishes.
bob
I work for a high end appliance manufacturer and we hear this from our customer quite frequently over the past 6 months. First off when you say the dishes are not getting clean is it food particulate being left on the dishes, an oily film or a white or grayish film. Each can be caused by different things. Possible corrective actions may include:
Food particulate: Verify that the spray arms are not obstructed, i.e. large plates, serving trays, pots.
Ensure spray arm jets are clean and not clogged.
Oily film: Indicates an issue with the heating system, service is required.
White/gray film: Can be an issue with water harndess, i.e. hard water or too soft water with too much detergent.
Most likely though related to detergent. As was stated previously Many detergent manufacturers have greatly reduced the phosphate levels in the detergents, replacing phosphates with enzymes as the primary cleaning agent. Try to find a detergent that does not state phosphate free or environmentally friendly, reduce amount of detergent to approx 1 tsp and judge cleaning results, you can always add more.
Currently the one detergent that has been the most consistent is Electrosol. And please stay away from the gelpaks, that is the equivalent of completely filling the dispenser and adding an extra squirt of liquid, way too much for most machines.