How to Clean a Smelly Dishwasher Effectively

Dishwashers are convenient but can develop stubborn odors from trapped food, grease, and mineral buildup. A cleaner, deodorizer routine restores fresh smells, improves cleaning performance, and extends the life of the appliance. This guide outlines practical steps using common dishwasher cleaning products and tools.

Quick Answer

Best first move: run an empty cycle with an automatic dishwasher cleaner to remove buildup, followed by a spray or powder deodorizer to keep odors at bay. For ongoing odor control, cleanse the tub and seals with a dedicated cleaner spray and scrub with a brush after each major clean.

What You’ll Need

Automatic dishwasher cleaner tablets odor eliminator
Dishwasher deodorizer powder odor removal
Dishwasher cleaning brush scrubber tool
Dishwasher tub and seal cleaner spray kit
Sump and spray arm cleaner for dishwasher

	Lemi Shine Natural Dishwasher Cleaner – Hard Water Citric Acid Cleaning Powder – Lemon Scented Eco-Friendly Dishwasher Cleaner & Deodorizer – 14.08 oz (8 Pack)
	Renuv® Heavy Duty Dishwasher Cleaner & Deodorizer Tablets, Descaler, Deep Cleaning, Natural Odor & Smell Remover, Calcium, Limescale, Hard Water Marks, Grease, Septic Safe Pods (12 Tabs 1 Yr Supply)
	Holikme 6 Pack Dish Brush Kitchen Brushes Set with Vegetable Palm Brush, Bottle Brush, Dish Brush and Straw Brush, Fruit Cleaning Brushes for Cleaning Potato Skillet Wok Pot Pan Cast Iron, Yellow

Before You Start

Remove all racks from the tub to access hard-to-reach areas. Check the spray arms for clogs and clear them with a toothpick or brush. For safety, unplug the unit or switch off the breaker before performing any deeper cleaning. Time guidelines: a basic deodorizing sweep takes about 60 minutes; a thorough tub and seal clean may take 1–2 hours including drying time. Warning: avoid mixing cleaners or using high-abalance chemicals that could harm seals or surfaces.

Step-By-Step: How To Clean A Smelly Dishwasher

Empty the dishwasher completely and remove both racks to expose the tub.
Spray the tub with the dishwasher tub and seal cleaner spray kit, focusing on seals and corners where mold tends to accumulate.
Let the cleaner sit for 5–10 minutes to loosen grime, then scrub the tub with the dishwasher cleaning brush scrubber tool.
Run a hot-water cycle with the dishwasher cleaner tablet odor eliminator placed in the dispenser to dissolve buildup from the interior walls.
Inspect the sump and spray arms for clogs; use the sump and spray arm cleaner for dishwasher to clear any obstructions.
Wipe the door gasket and hinge area with a damp cloth to remove residue and prevent mold growth.
Run another hot cycle without dishes to rinse away loosened debris and odors, using a fresh tablet if needed.
Reinstall racks and run a final empty cycle with just water to ensure all cleaner residues are cleared.
Optionally apply a dishwasher deodorizer powder odor removal after drying to maintain freshness between deep cleans.
Leave the door slightly ajar after the final cycle to promote complete drying and discourage odor formation.
Schedule quarterly deep cleans using the automatic dishwasher cleaner tablets to maintain performance.
Keep an eye on water hardness and adjust maintenance steps if you notice persistent mineral buildup.

Troubleshooting

Symptom	Likely Cause	Fix	Prevention
Persistent dishwasher odor after cleaning	Seal mold or trapped debris	Clean seals thoroughly with tub cleaner spray; re-clean with brush tool	Clean monthly; wipe seals after each load
Water not draining properly	Clogged sump or drain hose	Use sump cleaner and inspect hose; clear lint and food particles	Rinse plates before loading; use rinse aid
Food particles on dishes	Spray arms blocked or filter dirty	Clear spray arms and clean filter	Regular filter checks during deep cleans
Excessive vibration or noise	Improper rack placement or loose components	Realign racks; tighten interior panels	Reload dishes evenly; avoid overloading

Common Mistakes

Using bleach and ammonia simultaneously or mixing cleaners, which can create dangerous fumes.
Neglecting the door gasket and tub corners where mold hides.
Running harsh cycles with dishes left inside, which can spread odors rather than remove them.
Skipping the spray arm and sump maintenance, leading to clogged water flow.

Following these tips helps prevent recurring smells and ensures consistent cleaning performance.

Tips For Best Results

Run an empty cycle with a dedicated cleaner tablet at least every 1–3 months, depending on usage and water hardness.
Use a dishwasher deodorizer powder odor removal between deep cleans to keep smells away.
Wipe the door seal and the interior after each major wash to reduce mold-friendly moisture buildup.
Check the water heater setting; very hot water improves cleaner effectiveness but ensure it won’t damage plastic components.
Consider a monthly light scrub of the tub with a scrub brush to prevent mineral buildup in hard water areas.

Call A Professional

Consult a professional if there is persistent odor after multiple cleanings, visible mold growth, or if the dishwasher fails to drain or heat properly. Stop-use signs include unusual smoke, burning smells, or sparking components. If the unit is under warranty, contact the manufacturer or authorized service provider first to preserve coverage.

FAQ

Why does my dishwasher smell even after cleaning?

Odor can linger if mold grows on the door gasket or under the tub lip, or if mineral buildup blocks drainage and prevents thorough rinsing.

Can I use vinegar to deodorize my dishwasher?

Vinegar can help, but it’s best used sparingly and not as a sole cleaner on a regular basis, as it can degrade rubber seals over time.

How often should I deep clean my dishwasher?

Most households benefit from a deep clean every 1–3 months, depending on usage, water hardness, and odor tendency.

Is it necessary to run an empty cycle?

Yes, running an empty cycle with a cleaner tablet or spray ensures interior surfaces are thoroughly treated without introducing soiled dishes.

What if odors come back quickly after cleaning?

Repeated odor recurrence may indicate ongoing drainage issues, mold growth behind seals, or persistent mineral buildup requiring professional assessment.

Buying Guide

When choosing cleaning products and tools for a smelly dishwasher, consider several factors to optimize odor removal and maintenance.

<bSize and compatibility: Ensure cleaner tablets and sprays are compatible with your dishwasher model and size. Large tubs may benefit from stronger formulations.
<bOdor elimination efficiency: Look for products explicitly labeled as odor eliminators or deodorizer powders designed for dishwashers.
<bCleaning strength: Some kits include a tub and seal cleaner spray plus a sump and spray arm cleaner—these combinations address multiple odor sources.
<bEase of use: Choose products with clear instructions and tools (brushes, scrubbers) that fit your cleaning style.
<bMaintenance cadence: If odors are frequent, consider a monthly routine with a combination of cleaners and deodorizing powders to maintain freshness.
<bWater hardness considerations: Hard water fosters mineral buildup; assess whether you need mineral-removal steps or rinse aid usage as part of maintenance.
<bPlacement and storage: Store cleaners away from heat and moisture; keep tools organized in a clean cabinet near the kitchen sink for quick access.

With the right products and a regular cleaning routine, a smelly dishwasher becomes a rare issue rather than a recurring frustration. Would you like recommendations tailored to your dishwasher model or water hardness level?