Dishwashers stand as one of the most convenient kitchen appliances in our modern daily lives, saving us precious time by streamlining cleanup. Yet over months of continual use, dishwashers can emit unpleasant odors—from musty smells to foul, lingering scents. Whether you own a popular Whirlpool Corporation model or a high-end stainless-steel dishwasher, routine care is crucial to preserve its efficiency and fresh scent. In this blog, we’ll explore practical steps to clean a smelly dishwasher, address common causes like mold growth or food residue, and keep your machine in prime condition.

Identify Common Causes of Dishwasher Odors

Food Debris Accumulation

Bits of food sometimes fail to wash away, clinging to corners or building up in filters. Over time, these leftover scraps spoil, emitting a bad smell or leading to a stinky dishwasher. Food particles can also clog the drain hose or dishwasher water pump, resulting in improper drainage and unhygienic conditions.

Mold and Mildew Development

A dishwasher can stay slightly damp post-cycle—perfect for mold or mildew to thrive. The warm, moist environment enables mold to form around door seals, the soap dispenser, or interior walls. This growth leads to persistent musty odor or unpleasant smell each time you open the door.

Drainage Issues and Clogs

Obstructions in the dishwasher drain or garbage disposal can prevent proper water flow. If your dishwasher is connected to the same line as your disposal, any leftover bits of food or grease in the disposal can transfer unpleasant odors back into your dishwasher. Promptly addressing water backups spares you from more significant problems like leaks or additional mechanical damage.

Gather Necessary Cleaning Supplies

Preparing the right cleaning tools streamlines your approach to removing odors. Below are must-have items for deep cleaning your smelly dishwasher:

Natural Cleaning Agents: Vinegar and Baking Soda

White vinegar and baking soda offer excellent deodorizing properties. Vinegar’s acidic nature dissolves grease and minerals, while baking soda neutralizes unpleasant odors. Together, they deliver a double impact without harsh chemicals that might damage stainless steel dishwashers.

Tools for Cleaning: Brushes and Cloths

A soft-bristle brush, bottle brush, or old toothbrush helps dislodge food debris from corners and filters. Keep paper towels, a damp cloth, or microfiber cloth handy to wipe away soap scum, water deposits, and grime. A dishwasher-safe bowl or small bowl is beneficial for mixing vinegar or for placing inside your dishwasher to run a cleaning cycle.

Step 1: Check and Clean the Drain Filter

Remove Food Particles and Debris

Most modern dishwashers feature an easily detachable dishwasher filter located near the bottom of the tub. Access it by rotating or lifting; any food bits or leftover scraps can hamper water flow, leading to odd odors and potential blockages. Dislodge clinging food residue or minerals using a soft-bristled brush.

Rinse and Reinstall the Filter

Rinse the filter under warm running water, removing any final scraps. If there’s stubborn residue, gently scrub with a mild dish soap solution, focusing on the mesh or cylindrical filter. Afterward, slide or twist the filter back in place firmly for a secure fit.

Step 2: Unclog and Wipe Down Interior Parts

Clean the Spray Arms

Check the dishwasher spray arms for blockages from bits of food, minerals, or debris. Use a toothpick or flexible wire to clear any holes. This step ensures water jets spray freely, washing each dish thoroughly and fending off inefficient performance.

Wipe Down the Door Seals and Interior Walls

Door gasket seals or rubber edges can develop mold or residual water buildup, generating a musty odor. Dampen a damp cloth or microfiber cloth with soapy water to remove grease or soap scum. Make sure to wipe corners, the top edge of the door, and any strange or “hidden” spots. If the interior is stainless steel, avoid abrasive scouring pads that might cause scratches.

Step 3: Drain Any Standing Water

Use a Sponge or Towel for Excess Water

Occasionally, leftover wash water or residual water can remain at the bottom. This dirty water fosters bacterial growth, fueling your smelly dishwasher. Soak up any standing water with a towel or sponge to maintain a fresh environment.

Check for Any Blockages in the Drain

Inspect the dishwasher drain or drain hose for clogs. Hoses can be gently detached from the sink or garbage disposal line if you’re confident in your mechanical skills. Clear away soap scum, caked grease, or food bits to ensure smooth drainage.

Step 4: Run a Dishwasher Cleaning Cycle

Use a Vinegar Solution for Deep Cleaning

Place a dishwasher-safe bowl containing a cup or two of white vinegar on the top rack. Run the dishwasher on the hot cycle or hottest cycle to remove soap scum, food residue, and mineral deposits from your machine interior.

Optional: Add Baking Soda for Extra Odor Removal

After the vinegar cycle, you can sprinkle a cup of baking soda at the bottom of the dishwasher and run a short wash cycle on hot. This step further neutralizes any lingering odor-causing bacteria, resulting in a fresh, odor-free machine.

Step 5: Allow the Dishwasher to Air Dry

Leave the Door Open Post-Cleaning

Propping the door open after the cycle completes wards off mold or mildew buildup. This air circulation helps the tub dry out fully, averting new musty or foul smells caused by trapped moisture.

Check for Any Lingering Odors

Give the unit a quick sniff test once it’s dry. If you still detect unpleasant odors, do a second rinse with vinegar or investigate possible underlying mechanical issues requiring professional intervention.

Tips for Maintaining a Fresh-Smelling Dishwasher

Regularly Clean the Drain Filter

Perform a quick check each month or more often if you run frequent loads. Keeping the filter free from food residue prevents blockages and fosters consistent cleaning performance.

Use Dishwasher-Safe Cleaning Agents Periodically

Run a dishwasher cycle with specialized dishwasher cleaners or even baking soda and vinegar once every 1-2 months. This practice kills bacteria, dissolves leftover grease or minerals, and helps maintain an odor-free state.

Avoid Overloading the Dishwasher

Excess items hinder water jets from reaching every dish, leaving behind leftover food. Ensure there’s enough counter space on the dish racks for proper water flow, promoting a thorough wash and preventing odor-causing buildup.

Paragraph About Toronto Refrigeration

Since our founding, Toronto Refrigeration has dedicated itself to delivering exceptional quality and reliable service in kitchen appliances repair, including dishwashers, washing machines, and more. With decades of combined expertise, our appliance repair technicians provide same-day repair services, tackling even the most stubborn dishwasher malfunctions. We pride ourselves on transparent pricing, affordable rates, and an unwavering commitment to customer satisfaction, letting you enjoy a worry-free appliance experience.

Conclusion

From food residue clinging to filters, to mold thriving in warm, damp conditions—your dishwasher can accumulate unpleasant grime if left unchecked. Following our step-by-step guide helps remove bad smells, leading to fresh, sparkling dishes every time you open the door. For stubborn or recurring issues, turn to licensed technicians with specialized skills, ensuring thorough repairs and minimal risk. By adopting consistent cleaning habits—like monthly filter checks or vinegar cycles—you’ll preserve your dishwasher’s efficiency, keep your daily life comfortable, and spare yourself from costly breakdowns.

How to clean a smelly dishwasher?