How to Clean a Dishwasher Filter and Prevent Bad Odors

A dishwasher can look clean while food particles, grease, and detergent residue collect below the lower spray arm. In many modern machines, a removable filter catches this debris before it reaches the drain or returns to the dishes. If the filter is ignored, the dishwasher may develop odors, leave grit on glassware, drain slowly, or clean less effectively.

Cleaning the filter is usually a simple maintenance task, but the correct method depends on the appliance. This guide explains how to locate, remove, wash, and reinstall a reusable dishwasher filter without damaging its mesh or locking mechanism.

Check whether your dishwasher has a removable filter

Pull out the lower rack and inspect the floor of the dishwasher. A manual filter often looks like a round or cylindrical screen near the center or back of the tub. It may sit beneath a flat mesh plate and usually unlocks with a short twist.

Some older models use self-cleaning filters or grinders that are not intended for routine removal. Before forcing any part, check the model's use-and-care guide. The manual should show the filter location, removal direction, cleaning interval, and whether any components are dishwasher-safe.

What you need

Prepare a soft non-scratch brush, warm water, mild dish soap, a microfiber cloth, and a shallow bowl or clean sink. Useful options can be found in IRONSREAD's Cleaning Brushes, Sponges & Cleaning Cloths, and Dish Drying & Sink Tools collections.

Avoid wire brushes, steel wool, abrasive powders, drain cleaner, bleach mixtures, and sharp tools. These can tear fine filter mesh, scratch the tub, damage seals, or create unsafe chemical reactions.

How to clean a dishwasher filter step by step

1. Empty and cool the dishwasher

Wait until the wash and heated-dry cycles are complete and the interior is cool. Remove all dishes and slide out the lower rack. Turn the dishwasher off before working near the sump area. If the manufacturer recommends disconnecting power, follow that instruction.

2. Remove loose debris first

Look around the filter opening for labels, food fragments, glass, or other debris. Wear protective gloves if broken glass may be present. Use a damp cloth or paper towel to lift visible residue rather than pushing it farther into the drain area.

3. Unlock the filter gently

Follow the arrows or markings on the filter. Most cylindrical filters turn counterclockwise before lifting out, but designs vary. Support the component by its solid plastic frame rather than pulling on the mesh. If it does not move with light pressure, stop and consult the manual.

4. Separate only the approved parts

Some systems have an upper cylindrical filter and a lower flat screen. Remove each piece in the order shown by the manufacturer. Do not pry apart permanently joined components. Place small locking parts where they cannot fall into the sink drain.

5. Rinse with warm water

Hold the filter under warm running water to remove loose particles. Rinse from the cleaner side toward the dirtier side when possible so debris moves out of the mesh instead of deeper into it. Very hot water can distort some plastic components, so warm water is the safer default.

6. Soak stubborn buildup

If grease or cloudy residue remains, soak the reusable filter in warm water with a small amount of mild dish soap for about 10 to 15 minutes. A short soak softens buildup without requiring aggressive scrubbing. Do not soak electrical parts or components that the manual identifies as non-washable.

7. Brush with light pressure

Use a soft brush to clean the mesh, frame, and crevices. Work around the filter rather than bending the screen. Pay special attention to seams where grease can collect. If residue does not release, repeat the soak instead of switching to a harder brush.

8. Rinse and inspect

Rinse until no soap or particles remain. Hold the filter up to the light and check for clogged areas, tears, cracks, or a warped frame. A damaged filter may allow debris to circulate through the wash system and should be replaced with the correct model-specific part.

9. Clean the filter well

Before reinstalling the filter, wipe the exposed area with a damp microfiber cloth. Remove residue from the accessible rim and surrounding tub floor, but do not reach into the pump or drain opening. Never pour concentrated cleaner directly into the sump.

10. Reinstall and lock it

Return each part in the correct order. Rotate the filter until the alignment marks match and it locks securely. A loose filter can lift during a cycle and interfere with the spray arm. Spin the lower spray arm by hand to confirm that it moves freely before replacing the rack.

How to prevent dishwasher odors

A clean filter solves only part of the problem. Scrape large food scraps into the trash or compost before loading, but do not completely prewash dishes unless the appliance instructions require it. Excessive prewashing can cause some detergent systems to work less effectively, while large scraps can overload the filter.

Load dishes so water can reach every surface and avoid blocking the detergent dispenser or spray arms. After the cycle, allow the interior to dry according to the manufacturer's guidance. Regularly wipe the door gasket and lower door edge, where moisture and residue often collect.

Keep the nearby sink and cleaning tools sanitary as well. See How to Clean a Kitchen Sink and Drain Properly and How to Clean and Store Reusable Sponges and Cloths for related routines. The 15-Minute Kitchen Reset can help make these small maintenance tasks easier to remember.

How often should you clean the filter?

For many households, a monthly inspection is a practical starting point. Clean it more often if you run the dishwasher daily, load heavily soiled cookware, notice food particles after a cycle, or smell an odor when opening the door. Households that scrape dishes carefully and run fewer cycles may need less frequent cleaning.

Use the machine's performance as a signal. Grit on dishes, standing water, unusual noise, slower drainage, or persistent odor can indicate a dirty filter—but they can also point to a blocked hose, spray arm, or drain problem. If cleaning the accessible filter does not solve the issue, stop using the appliance and consult the manual or a qualified technician.

What not to do

• Do not force a filter that will not turn or lift.
• Do not use sharp objects to clear mesh openings.
• Do not mix bleach with vinegar, ammonia, or other cleaners.
• Do not reinstall a cracked, torn, or warped filter.
• Do not run the dishwasher without the filter securely locked in place.

A simple maintenance habit

Add the dishwasher filter to a monthly kitchen check. Inspecting it takes less than a minute, and cleaning light buildup is easier than removing months of hardened grease. Warm water, mild soap, a soft brush, and careful reinstallation are usually all a reusable filter needs.

Always prioritize the instructions for your exact dishwasher model. With a clean filter and a few consistent loading and drying habits, the machine can clean more reliably while the kitchen stays fresher between cycles.