Very glad to have found this forum. Hopefully some of you appliance guru's might know whats going on. A week ago I noticed that the dishes were not looking very clean after running through our normal wash cycle with our Whirlpool DU1055XTPQ4 . I noticed that there was probably 20% of the liquid detergent we have used for years still in the detergent tray. I have run the dishwasher several times since and same problem. Any suggestions?