I have the Whirlpool Quiet Partner III. It was installed new in July 2007. It is/was used on a regular-basis once a week. Dishwasher was running normally until 5-22-11. Now at end of a full cycle, dishes are still dirty and only some of the soap has been used up, whether it is Cascade powder or Cascade Action Pacs. I always use the recommended amount in the soap dispensers. Please advise. Thanks Douglas Smith

Make sure your water temperature is hot enough to dissolve the soap. Generally, the water temp. should be 140 degrees. Run some hot water at the tap before you turn on the dishwasher. This will assure that hot water is in the dishwasher as soon as you start it. Be certain that there aren't any large pieces in front of the dispenser tray. Sometimes casserole dishes, frying pans or baking pans can block the door and prevent it from opening.
Also, the sprayer arms might be clogged with bone fragments, peelings, bits of paper, etc. If this is the case, you'll need to remove the sprayer arm, flush and then check the jets. If you see "stuff" in the jets, they can be remove with tweezers.
Finally, make sure the upper sprayer arm hose is securely seated with the tube in the back of the dishwasher that carries the water up to the sprayer arm hose. If these two are not seated correctly, the water will not travel into the sprayer arm hose, the sprayer arm will not turn and your dishes will not get clean! I hope this helps. If it does, please come back to Fixya and rate my advice.