Dishwasher Not Cleaning Dishes? Common Reasons and Fixes

A dishwasher that leaves food residue behind defeats the whole purpose of having one. Before assuming the machine is broken, a few common culprits are worth ruling out first.

Blocked Spray Arms

The spray arms have small holes that shoot water onto your dishes, and these holes can get clogged with food particles or mineral deposits. Removing the arms and rinsing them under running water is a simple first step.

A Dirty Filter

Most dishwashers have a filter at the bottom of the tub that catches food scraps. If this filter is not cleaned regularly, it can restrict water flow and leave a gritty residue on dishes.

Hard Water Buildup

In areas with hard water, mineral deposits can coat the inside of the dishwasher and its spray arms over time. A monthly rinse with a dishwasher cleaner or white vinegar can help cut through this buildup.

Loading the Dishwasher Incorrectly

Large plates or pans placed in the wrong spot can block the spray arms from spinning freely. Leaving enough space between items lets water reach every surface.

A Failing Wash Pump

If the steps above do not solve the problem, a worn wash pump may not be circulating enough water pressure to clean dishes properly. This is a mechanical part that needs a technician to test and replace.