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How to Descale a Dishwasher

Home/Resources/Cleaning & Laundry/Descaling a Dishwasher
DH
Written & researched by Derek Holt Home & Appliances Editor
Updated August 2026
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Descaling a dishwasher is an easy DIY maintenance job of about 10 minutes of active work plus a cleaning cycle, costing only the price of vinegar or a descaler. No permit or pro is involved. The task clears the limescale, grease and food debris that make a dishwasher clean poorly and smell. The surprise for most people is that the filter, not the machine, is usually the culprit behind bad cleaning, so this job is really two jobs: clean the filter and spray arms, then descale the interior.

Easiest Way to Descale and Clean a Dishwasher With Vinegar — Every Day Jay

Step-by-step: filter, spray arms, then descale

  1. Empty the machine. Remove all dishes and pull out the bottom rack for access to the tub floor.
  2. Remove and clean the filter. Twist out the cylindrical filter, rinse it under hot water, and brush trapped food and grease from the mesh. Wipe the filter housing.
  3. Clear the spray arms. Check the spray-arm nozzles for blockages and poke clogged holes clear with a toothpick or thin wire so the jets run full strength.
  4. Wipe the interior and seals. Wipe the door edges, the rubber gasket and the tub bottom, where grime and scale collect.
  5. Add vinegar or descaler. Place a bowl with one to two cups of white vinegar on the top rack, or add a dishwasher descaler or cleaner tablet per its directions.
  6. Run a hot cycle. Run the hottest cycle on the empty machine so the descaler disperses and dissolves limescale on the element and interior.
  7. Optional freshen. Sprinkle baking soda on the tub floor and run a short hot rinse to deodorize.
  8. Reseat everything. Confirm the filter is locked in and the spray arms spin freely before the next load.
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Tools and materials

You need white vinegar or a dishwasher descaler, baking soda, a soft brush and a cloth. A well-maintained dishwasher is part of a clean kitchen routine, and for the counters, cabinet fronts and floor around it, our all-purpose cleaner picks handle the surrounding surfaces. The same hard-water scale you just removed also dulls faucets and sinks, so the methods in our steam mop roundup and companion guides keep the whole kitchen from building up mineral film.

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Mistakes that keep a dishwasher underperforming

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Notes and safety

This is low-risk DIY. The cautions are minor: never mix vinegar or cleaners with bleach, check your manual before using vinegar since a few makers advise against it on certain seals, and take care around the sharp edges some filter housings have. There is no code or permit involved. If the dishwasher leaks, will not drain after the filter is clean, or the heating element is failing, that is a repair rather than a maintenance task and may warrant a technician.

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More from this hub: Cleaning & Laundry · Clean a washing machine · Remove hard water stains · Clean stainless steel appliances · Best all-purpose cleaners · How we rank

Straight Answers

Frequently Asked

How often should you descale a dishwasher?

Run a descaling or cleaning cycle once a month in a hard-water area and every two to three months in a soft-water area, and clean the filter more often, ideally every week or two. Hard water deposits limescale on the heating element, spray arms and interior faster, which is why the interval depends on your water. If glasses come out cloudy, the interior feels gritty, or you see white chalky buildup, you are overdue. Regular descaling keeps the machine cleaning well and protects the heating element and pump from scale damage.

Can you descale a dishwasher with vinegar?

Yes, white vinegar is a common and effective descaler. Place a dishwasher-safe bowl or cup filled with about one to two cups of white vinegar on the top rack of an empty machine and run a hot cycle, which lets the vinegar disperse and dissolve limescale and grease. Do not pour vinegar directly into the bottom, where it drains out too fast. A dedicated dishwasher descaler or cleaner tablet works too and is formulated for the job. Check your manual, since a few manufacturers advise against vinegar on certain seals.

Why is my dishwasher not cleaning dishes well?

The most common cause is a clogged filter, not a broken machine. The filter at the bottom of the tub traps food debris, and when it fills, dirty water recirculates and redeposits grime on your dishes. Clogged spray-arm holes and limescale buildup make it worse by weakening the water jets. Pull and rinse the filter, clear the spray-arm nozzles, and descale the interior, and cleaning performance usually returns. Also make sure you are not blocking the spray arms with tall items and that the rinse-aid reservoir is not empty.

How do you clean a dishwasher filter?

Remove the bottom rack, then twist and lift out the cylindrical filter assembly at the base of the tub, usually a quarter turn. Rinse it under hot running water, and use a soft brush to clear trapped food, grease and debris from the mesh and the coarse filter. Wipe out the filter housing too, where gunk collects. Reseat the filter and lock it back in, making sure it is fully seated, because a filter left loose can let debris into the pump. Do this every week or two for best results.

What is the white residue in my dishwasher?

White chalky residue on the interior, the heating element and your glassware is limescale from hard water, mineral deposits left behind as water evaporates. A cloudy white film on glasses can also be etching, which is permanent, or detergent residue, which is not. Descaling with vinegar or a dishwasher descaler removes limescale buildup, and adding rinse aid and not overdosing detergent helps prevent film. If the film wipes off with vinegar, it was scale or residue; if it does not, the glass is likely permanently etched.