Why Do Dishwashers Smell?
If you’ve ever opened your dishwasher and been hit with an unexpected stink, you’re not alone. For a machine built to clean, it’s surprisingly common to ask: why do dishwashers smell?
While it might feel like your dishwasher is betraying you, the odor usually comes from completely fixable causes. This article breaks down the most likely culprits, how to stop the smell, and how to keep your dishwasher fresh permanently.
The Culprit Behind That Dishwasher Smell
Why do dishwashers smell? The short answer is: trapped food particles, grease buildup, and mold-friendly moisture.
Unlike your sink, dishwashers recycle water during a cycle. That water can carry food scraps and grease. Over time, these particles collect in hard-to-reach spots like the filter, door seals, and drain hose. Add some leftover moisture, and you’ve got a recipe for mildew, bacteria, and bad smells.
Common Reasons Your Dishwasher Smells Bad
Here’s a breakdown of the usual suspects behind the stink:
1. Dirty Filter
Most modern dishwashers have a removable filter at the bottom. If it’s clogged with food particles, it can rot and smell like old garbage.
Fix: Remove and rinse the filter under warm water weekly. Scrub with a brush and soap every month.
2. Standing Water
If your dishwasher doesn’t fully drain, water can sit in the bottom and breed bacteria.
Fix: Check the drain for blockages. You may need to clean out the drain hose if clogs are common.
3. Grease and Soap Scum Buildup
Grease from your dishes can coat the inside of the machine. Soap scum adds a sticky layer where bacteria thrive.
Fix: Run a cycle with dishwasher cleaner.
4. Rubber Gasket & Seals
Food and grime can hide in the rubber door seal and gasket. These spots are rarely rinsed during normal cycles.
Fix: Wipe the seal and edges of the door.
5. Mold & Mildew
A damp, closed dishwasher is perfect for mold.
Fix: After a cycle, leave the door slightly open to let the interior dry out.
Preventing Future Dishwasher Smells
It’s easier to prevent a smelly dishwasher than to fix one. Add these habits to your cleaning routine:
Rinse Food Chunks
You don’t need to pre-wash, but scrape off large bits before loading dishes.
Clean the Filter Weekly
Think of the filter as a tiny garbage trap. Don’t let it fester.
Use the Right Detergent
Cheap pods can leave residue that builds up over time. Use a reputable brand.
Run Hot Water Before Starting
Flush hot water into the system by running your sink until it’s hot before starting the dishwasher.
Is It Ever Something More Serious?
If you’ve done all the above and your dishwasher still smells, consider these boring but important problems:
Clogged drain hose: A kink or clog could cause pooling water.
Blocked air gap: The small cylinder near your sink faucet (if you have one) may need a clean.
Worn seals or insulation: Trapped gunk inside the machine’s hidden parts may require professional service.