Most Reddit commenters said dishwasher-cleaner tablets can help, though results vary by brand; many suggested powdered citric acid as a cheaper option. Some warned that using citric acid every cycle may reduce detergent effectiveness or encourage rust when metal items are washed.
Commenters said buildup can remain without machine maintenance and pointed first to the filter, as well as spray arms and door seals. Some also warned that vinegar can damage seals and gaskets. Commenters said manufacturers such as GE recommend this kind of cleaning only occasionally.
