Nothing ruins the satisfaction of clean dishes faster than a foul-smelling dishwasher. If your kitchen appliance emits an unpleasant odor every time you open it, you’re not alone. Many homeowners wonder how something designed to clean can end up smelling so bad. The good news is, with the right steps, you can easily restore freshness and ensure your dishwasher performs at its best. This guide explains how to clean a stinky dishwasher thoroughly and prevent odors from returning.

Why Does My Dishwasher Smell?

Before diving into the cleaning process, it helps to understand why your dishwasher smells bad in the first place. There are several common culprits behind unpleasant dishwasher odors:

1. Standing Water and Mold Growth

If water pools at the bottom of your dishwasher, it creates a breeding ground for mold and mildew. This often happens when the drain gets clogged or when the appliance remains closed for long periods, such as during a vacation. The trapped moisture and lack of ventilation encourage mold spores to thrive, leading to a musty or sour smell.

2. Food Particle Build-Up

Leftover food scraps from plates and pans can get trapped in the drain filter, hose, or spray arm. Over time, these particles decompose, releasing strong, rancid odors—especially if they include eggs, fish, or dairy products. The buildup also affects cleaning performance, leaving dishes less sanitary after each cycle.

3. Soap Scum and Grease Residue

Dishwashing detergents can leave behind a film of soap scum mixed with grease and hard water minerals. This residue accumulates on the walls, racks, and door seals, eventually developing a stale smell. A regular deep-cleaning routine can prevent this issue and keep your dishwasher running smoothly.

Step-by-Step Guide: How to Clean a Stinky Dishwasher

Cleaning a dishwasher doesn’t require harsh chemicals or expensive products. Follow these easy, practical steps using everyday household items.

1. Clean the Drain Filter

The drain filter is one of the most common sources of dishwasher smells. If your model includes one, it’s typically located at the bottom rear of the tub. Here’s how to clean it effectively:

  • Remove the filter carefully and rinse it under hot, soapy water.

  • Use a soft brush or old toothbrush to scrub away trapped debris and grease.

  • Inspect the drain opening for leftover food particles and wipe them out with a sponge.

  • Once clean, reinsert the filter securely before moving on to the next step.

A clean filter ensures proper drainage and helps eliminate trapped odors from decomposing food.

2. Clean the Spray Arms

Clogged spray arms reduce water flow, cause uneven cleaning, and contribute to lingering smells. To clean them properly:

  • Remove the top and bottom spray arms from your dishwasher.

  • Hold each over the sink and use a toothpick or paperclip to dislodge any trapped particles in the holes.

  • Run warm water through the openings to ensure they are clear.

  • Reinstall the spray arms once fully clean.

This step improves your dishwasher’s efficiency while preventing odor-causing buildup.

3. Wash the Interior Surfaces

Over time, soap residue and grime collect on the interior walls, racks, and rubber door seals. Here’s how to restore that fresh, clean surface:

  • Mix hot water with dish soap or mild detergent.

  • Use a sponge or soft scrub brush to wipe down the walls, racks, door gasket, and corners.

  • Pay attention to areas where mold or grime tends to accumulate, such as under the door seal or around the hinges.

  • Wipe everything dry with a clean cloth when finished.

This step removes visible dirt and kills bacteria responsible for odor.

4. Run Empty Dishwasher Cycles with Vinegar and Baking Soda

These natural cleaning agents are safe, affordable, and powerful deodorizers. The vinegar-and-baking-soda method provides a final deep-clean that neutralizes any lingering smells.

Step 1: Vinegar Cycle

  • Place a heat-safe bowl filled with one cup of distilled white vinegar on the top rack.

  • Run a normal, hot-water cycle.

  • The vinegar will dissolve grease, remove soap scum, and disinfect the interior.

Step 2: Baking Soda Cycle

  • After the vinegar cycle, sprinkle one cup of baking soda on the bottom of the dishwasher.

  • Run a short, hot-water cycle (without detergent).

  • Baking soda absorbs remaining odors and brightens the interior.

Once complete, your dishwasher should smell clean and fresh again.

How to Prevent Dishwasher Smells in the Future

Keeping your dishwasher odor-free requires consistent maintenance. Use these preventative measures to ensure long-lasting freshness:

  • Scrape and rinse dishes before loading them to reduce food buildup.

  • Clean the drain filter every few weeks to prevent clogs and stagnant water.

  • Run a vinegar or baking soda cycle monthly to maintain cleanliness.

  • Leave the door slightly open after each cycle to allow moisture to escape.

  • Avoid running other hot-water appliances simultaneously to ensure proper water temperature and pressure.

These simple habits can save you time, prevent unpleasant odors, and extend your dishwasher’s lifespan.

Final Thoughts

Learning how to clean a stinky dishwasher not only keeps your kitchen smelling fresh but also improves the appliance’s performance. Regular maintenance using natural ingredients like vinegar and baking soda helps you avoid costly repairs and ensures your dishes always come out spotless. With just a little effort, your dishwasher can stay as clean as the dishes it washes.