How to Fix a Dishwasher That Smells Bad

A dishwasher is meant to make your kitchen cleaner—not smell worse. But when your dishwasher starts giving off a foul odor, it can quickly become an annoying problem. The good news is that you don’t always need a new machine or costly repairs. You just need to know where to look and how to clean it the right way.

In this guide, you’ll learn what causes your dishwasher to smell bad, how to fix it step by step, and what you can do to keep it smelling fresh for good.

What Causes a Dishwasher to Smell Bad?

Before you start scrubbing, it’s important to understand the source of the smell. Most dishwasher odors come from trapped food particles and standing water, but there are a few common culprits:

• Dirty or clogged filter: The filter traps food debris. If not cleaned regularly, it starts to rot and smell.
• Mold around door seals: Moisture gets trapped in the rubber gasket, leading to mold and mildew growth.
• Grease or food inside spray arms: Small particles get stuck in the holes and break down over time.
• Drainage issues: Water that doesn’t drain properly will sit in the bottom of the dishwasher and smell.
• Hard water buildup: In Southern California, hard water is common. Over time, minerals mix with food waste and cause foul odors.

How to Diagnose the Source of the Smell

Before you clean anything, do a quick check to find out where the smell is coming from. Here’s a simple checklist:

• Open the dishwasher and sniff near the door gasket
  If it smells moldy, it’s likely mildew around the seal.
• Pull out the bottom rack and look at the filter
  If you see food or gunk, the filter needs cleaning.
• Inspect the spray arms
  Check for clogged holes or greasy buildup.
• Look under the filter at the drain area
  Standing water or slime could mean the drain is partially blocked.
• Run a short cycle
  If it smells during or after the cycle, it’s time for a deep clean.

Step-by-Step Guide: How to Fix a Smelly Dishwasher

a. Clean the Filter Thoroughly

This is the most common cause of dishwasher odor.

1. Remove the bottom rack.
2. Twist and lift the filter out.
3. Rinse it under warm water.
4. Use a soft brush and dish soap to remove grease and debris.
5. Rinse and reinstall.

If your dishwasher still smells, move on to the next step.

b. Scrub the Door Gasket and Interior Walls

Use a toothbrush or sponge with a mix of baking soda and water.
Wipe around the rubber gasket and door edges.
Dry the area to prevent new mold from forming.

You can also check out our tips on how to prevent mold in your washing machine—the same principles apply here.

c. Clean the Spray Arms

Spray arms can trap grease and food inside the small holes.

1. Remove the spray arms (usually a simple twist-off).
2. Rinse under hot water.
3. Use a toothpick or small wire to clear out the holes.
4. Reinstall the arms.

d. Flush the Drain and Drain Hose

If you notice standing water or slow draining, the hose may be clogged.

1. Check the drain area under the filter for blockages.
2. Use a turkey baster to flush it with hot vinegar.
3. If smells continue, the drain hose might need to be cleaned or replaced.

Learn more about drainage issues in dishwashers in our post: Dishwasher Not Draining?

e. Run a Dishwasher Cleaning Cycle

You can do this naturally or with a store-bought cleaner.

For a DIY cycle:

1. Place a bowl of white vinegar on the top rack.
2. Run the dishwasher empty on the hottest setting.
3. After the cycle, sprinkle a cup of baking soda on the bottom and run a short hot cycle.

This removes grease, limescale, and odors.

f. Use Odor Absorbers or Deodorizers

To keep things fresh between deep cleans, try:

• Baking soda in a small dish inside the machine
• Dishwasher-safe deodorizer pods
• Rinse aids that reduce buildup

Avoid masking the smell with fragrances—instead, eliminate the cause.

Preventing Dishwasher Odors in the Future

Keeping your dishwasher clean doesn’t have to be a hassle. Here’s what you can do to stop odors from returning:

• Scrape food off plates before loading
• Clean the filter every 1–2 weeks
• Wipe down door seals monthly
• Run hot cycles with vinegar once a month
• Leave the door open slightly after each cycle
  This helps air out moisture that causes mold.

If your water is hard, consider using a rinse aid or water softener to reduce mineral buildup.

When to Call a Professional

If you’ve cleaned everything and the smell keeps coming back, it could be a sign of a bigger issue. You may need help with:

• A clogged or broken drain pump
• Mold inside hard-to-reach parts
• A failing motor or circulation system

Our team at Appliance Repair Southern California can inspect and repair your dishwasher quickly. We service all major brands including GE, Bosch, Whirlpool, and Samsung.

If you’re in the Temecula or Murrieta area, you can also check our local dishwasher repair services.

Best Products for Cleaning a Smelly Dishwasher

If you prefer ready-to-use products, look for:

• Finish Dishwasher Cleaner
• Affresh Cleaning Tablets
• Lemi Shine Machine Cleaner
• Dishwasher-safe deodorizer packs

Stick with brands made specifically for dishwashers to avoid damage.

Related Topics You May Also Like

• Dishwasher Not Draining? Here’s How to Fix It
• How to Prevent Mold in Your Washing Machine
• Bosch Dishwasher Blinking Red Light Fix
• Home Dishwasher Repair Services

FAQs: Fixing a Smelly Dishwasher

Need help fast? Book an appliance repair technician in Southern California and get your dishwasher back to working—and smelling—like it should.