Short answer: a dishwasher that leaves dishes gritty, filmy, or wet usually isn't broken — it's a clogged filter, blocked spray arms, water that's too cold, or hard-water film. Work through the free checks below in order; most "not cleaning" complaints never make it to a repair call.
1. Clean the filter (do this first)
At the bottom of the tub, under the lower spray arm, is a twist-lock filter. Pull it out, rinse it, give it a gentle scrub, and reseat it. A filter packed with food sludge is the number-one reason dishes come out dirty — and the number-one thing people never clean. Make it a monthly habit.
2. Clear the spray arms
The spray arms have small holes that jet water onto your dishes. Bits of food, seeds, and hard-water scale plug them. Pop the arms off (usually a clip or twist), poke the holes clear with a toothpick, and rinse. Then spin each arm by hand — if it doesn't turn freely, something's blocking it.
3. Run hot water first
Dishwashers clean best with water around 120°F. If the incoming water is cold, detergent doesn't dissolve and grease doesn't lift. Run your kitchen sink's hot tap for a few seconds before starting the dishwasher so it fills with hot water from the start.
4. Fix hard-water film
A white, chalky film on glasses is hard water, not a fault. Keep the rinse-aid dispenser filled, and run an occasional cleaning cycle with dishwasher cleaner or citric acid. In hard-water areas this is routine maintenance.
5. Use fresh detergent — and load smarter
Detergent goes stale and clumps; old powder cleans poorly. Use fresh detergent, and don't overload or nest items — water has to actually reach every surface. Tall items in the center can block the spray arm's reach.
6. Check the water fill
If the tub isn't filling with enough water, the inlet valve or float switch may be the issue — not enough water means not enough cleaning. This one usually needs a tech to confirm.
7. Wash pump motor
If the filter's clean, the arms are clear, the water's hot, and it still won't clean, the wash pump motor may be failing — there's no water pressure to drive the spray. That's a repair.
When to call a pro
DIY everything in 1–5 — together they solve most cases for free. Call a tech if the dishwasher isn't filling properly or the wash pump has failed, since those need parts matched to your model.
Sizing up the decision? See repair vs. replace and typical repair costs. When you want it fixed right, GUIFIX does dishwasher repair — $75 service call, written quote, 90-day warranty, same-day available.
Frequently Asked Questions
Why is my dishwasher not cleaning dishes properly?
Most of the time it's a clogged filter or blocked spray arms — food debris stops water from reaching the dishes. Cold incoming water, hard-water film, overloading, and old detergent are the other big causes. Cleaning the filter and clearing the spray-arm holes fixes a large share of complaints.
Where is the dishwasher filter and how do I clean it?
It's at the bottom of the tub, usually a twist-lock cylinder under the lower spray arm. Twist it out, rinse it under the tap, scrub gently with a soft brush, and reseat it. Doing this monthly prevents most 'not cleaning' problems.
Why are my dishes coming out with a white film?
That's almost always hard water. Use a rinse aid, run an occasional cleaning cycle with dishwasher cleaner or citric acid, and make sure the rinse-aid dispenser isn't empty. In hard-water areas this is maintenance, not a malfunction.
Is it worth repairing a dishwasher that won't clean?
If the easy fixes (filter, spray arms, rinse aid, hotter water) don't solve it, the wash pump or inlet valve may have failed — both are worthwhile repairs. Dishwashers last 9–12 years; repair is usually the right call before the 8-year mark.
Dishwasher still not working?
$75 service call · free written quote · 90-day warranty · same-day available
In Pittsburgh? See Dishwasher Repair in Pittsburgh.