Kuds50 doesn't clean top rack - KitchenAid KUDS50FVSS Builtin Dishwasher

Check the jet holes on the sprayer arms. The outside holes usually plug first from calcification and centrifugal force causing only the center areas to clean. Remove these arms and shake out all of the "little white rocks" and then run the machine empty with a de-calcifying cleaner.

Pour boiling water into the dispenser, it may be gunked up with soap residue

The belt may have just come off. You may be able to get to it from the back or by removing the very top.

see the diagrams.

Hi, have you cleaned filters out and then put a cleaner in and run it through ?

This is caused by the chopper screen being pluged up you have to take the sump apart and clean the chopper.

There is a button on the top receiver bracket on the left side... when you take the rack support bracket out you will see it. Take a damp sponge and go over that area, pressing the plunger/button in several times. That should do it. Sometimes grease build up can prevent the button from popping out all the way, so the oven thinks that the racks are still in there.

Hi

If the top rack of the dishwasher doesn't get clean, check your appliance to see if you can fix the problem.
First check the spray Arms to make sure the holes in the spray arms are free and clear of debris. Your dishwasher should have several spray arms, including one at the bottom of the tub, one under the top rack, and possibly a third spray arm on the top of the tub. Sometimes food and mineral deposits can block holes in the spray arms, preventing water from spraying effectively. If this occurs, warm some white vinegar and pour it into a spray bottle. Spray the holes with the vinegar and dislodge debris with a toothpick or large safety pin.

Then check to see if your dishwasher has clogged filters. Filters generally cover the drain valve area to catch debris as the water drains from the dishwasher. Many dishwashers have maintenance-free filters, but your dishwasher may have filters that need cleaning. Read your owner's manual before you perform any filter maintenance to avoid damaging your dishwasher.

Check your water temperature to make sure it's hot enough. Water that is under 120 degrees Fahrenheit may not be hot enough to clean dishes effectively. Turn your kitchen hot water tap on and wait until the water warms up completely. Fill a cup and measure the water temperature with a kitchen thermometer. If the water is less than 120 degrees Fahrenheit, turn your water heater up to 120 degrees.

Load the top rack properly. Place cups and bowls upside down in the rack and don't nest dishes because this can prevent water from reaching dishes. Don't overload the top rack. Instead, position each item so the dirty areas of the dishes will receive full contact with water spraying up from the main spray arm located beneath the top rack. Prevent items from hanging below the top rack, which could prevent the spray arm from rotating.

Also check this link for more helpful info:-

http://www.ehow.com/info_7977311_top-dishwasher-not-getting-clean.html

Please get back to us if you have further query else please accept the suggestion.
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check to see if the jets in the spiner are clean and free from limescale

Connie,, make sure in loading the dishwasher you have room for the soap and water to make it to the top rack, (older models) on newer models you have a sprayer just under the rack make sure the sprayers are working fully,, to clean them you can use a hard brush and vinegar,, let stand for 5 minutes and rinse off, also, you can run vinegar ( white) through your machine,, to help clean the jets,, use in place of the soap , then run a couple of times empty to remove and let over odor