Taking steps such as loading fewer dishes, removing obstructions that impair the spray arm, and ensuring water temperatures are not too low can ensure that dishwashers are able to clean dishes effectively. Issues such as a faulty heating element or a poor-quality detergent may also lead to unclean dishes.
Checking and adjusting water levels, pressure and temperature can remedy many common issues.
Appliance owners may also benefit from cleaning filters and inlets, removing blockages and verifying that drain valves are operating properly. Hard water, appliances that fail to close properly and loading dishes that contain too much food residue may also lead to unclean dishes. The services of a professional technician may be required to address more serious electrical or plumbing issues.