Open the appliance's door slightly on the KitchenAid dishwasher to turn off the appliance, and pull down the dishwasher's door.
Wet a sponge under hot, running water and sprinkle powdered dishwashing detergent onto the sponge.
Pull out the top rack of the dishwasher and scrub the rack with the damp sponge. Re-wet the sponge and continue brushing the rack until all of the residue is cleaned off.
Fill the main wash compartment in the dishwasher to the "Hard Water" line, and push the top rack back into the dishwasher.
Pull up the dishwasher's door to close it. Push "Normal Wash" and "Start/Resume" to run a cleaning cycle and eliminate remaining loose debris.
Place a cup of vinegar on the top rack and run the dishwasher through a rinse cycle if further cleaning is needed.