Dishwasher maintenance: the filter, the spray arms and the monthly two minutes

4 min read · updated September 28, 2026 · White Goods Verified

Modern dishwashers are quieter and wash better than ever, and they have one maintenance quirk their owners were never told about: the manual filter. Five minutes every couple of months keeps a decade-old machine washing like new. Here is the short list, and the habits that prevent the classic complaints — smells, films and grit.

Key takeaways

If your dishwasher has a manual-clean filter (most made this decade), rinse it under a tap every one to three months — a clogged filter is the #1 cause of smells and gritty films.
Spray-arm jets clog with seeds and labels; clear the holes with a toothpick and the arms spin free again.
A monthly hot cycle with a dishwasher cleaner (or a cup of white vinegar on the top rack) dissolves grease and mineral film.
Load with the dirty surfaces angled at the spray; pre-rinsing modern detergents is counterproductive — enzymes need soil to latch onto.

The filter: the two-minute job that prevents everything

Twist out the cylindrical filter in the floor of the tub (most release with a quarter-turn), rinse under hot water with a soft brush, and re-seat it until it clicks. Every one to three months; monthly if you run dishes with scraps daily.

Signs it's overdue: gritty 'sand' on clean glasses, an earthy smell, or standing water. Most 'my dishwasher stopped washing well' service calls end at this filter.

Spray arms and the gaps

Pop the lower spray arm off (most pull or clip off) and clear the jet holes with a toothpick — watermelon seeds, fruit labels and toothpick fragments are the classic clogs. Spin both arms by hand to confirm they turn freely; a binding arm washes one strip of the rack and nothing else.

The monthly de-grease and de-scale

Run an empty hot cycle with a dishwasher cleaner tablet, or a dishwasher-safe cup of white vinegar on the top rack. This dissolves grease film and hard-water minerals — the two things that make 'clean' dishes look dusty.

Hard-water homes: consider a rinse aid regardless of drying preference. It breaks water surface tension, which is what spotting actually is.

Loading habits that substitute for maintenance

Angle dirty surfaces inward and down toward the spray. Skip pre-rinsing — modern enzyme detergents need soil to work, and pre-rinsed 'clean' dishes give them nothing to attack, so they attack glassware.

Use the right amount of detergent: too much leaves film, too little leaves soil. Fill per the detergent maker's line for your water hardness.

Frequently asked questions

How often should I clean my dishwasher filter?

Every one to three months for a manual-clean filter, monthly in heavy-use or scrappy-load households. If your model has a hard-food disposer, there is no filter to clean — run a cleaner tablet quarterly instead.

Why do my clean dishes have a gritty film?

That is filter overflow: food residue recirculating because the filter is saturated. Remove, rinse and re-seat the filter, run a hot cycle, and it resolves. Persistent films in hard-water areas point to a rinse-aid deficit.

Can I use regular dish soap in a dishwasher?

No — it foams uncontrollably and can leak onto the floor. Use detergent formulated for dishwashers; tabs, gel or powder all work, dosed to your water hardness.