Unlike manual dishwashing, which relies largely on physical scrubbing to remove soiling, the mechanical dishwasher cleans by spraying hot water at 130 to 170 degrees f. at the dishes.
A mix of water and detergent is used for cleaning purposes, followed by clean water to remove the detergent residue.
Some dishwashers have multiple wash and rinse periods within the complete cycle. In some dishwashers, a rinsing aid can be added to the rinse cycle.
One of the most important things to remember is never use regular dish soap in a dishwasher. Liquid dish soap will cause a huge amount of bubbles and suds to build up and will spill out from the dishwasher.
Only use detergent that is specifically for dishwashers.
Never overload a dishwasher. A dishwasher needs space between the dishes so that the jets of water can reach every surface.
If the water is overloaded, then the water cannot get anywhere and the dishes do not get clean.