Why Does My Dishwasher Smell?

Causes, Prevention, and Easy Fixes

A dishwasher is supposed to leave your dishes sparkling clean and odor free, but what if instead of that fresh scent, you notice an unpleasant smell when you open the door? A smelly dishwasher is a common issue, and while it can be frustrating, it’s usually easy to diagnose and fix once you know the causes.

Why Dishwashers Start to Smell

Food residue buildup. Tiny bits of food can get trapped in the filter, spray arms, or drain. Over time, these scraps decompose and release bad odors.
Grease and soap scum. Grease, oils, and detergent residue can coat the interior walls and hoses, creating the perfect environment for bacteria and mold.
Standing water. If water doesn’t drain properly, it can stagnate and develop a musty smell. This is often linked to a clogged drain or kinked hose.
High humidity. The dishwasher is a moist, warm environment. If the door is always closed, that humidity has nowhere to go, which encourages mildew growth.

How to Prevent Dishwasher Odors

Clean the filter regularly: Most dishwashers have a removable filter at the bottom. Rinse it under warm water and scrub off any trapped debris.
Check the drain: Make sure nothing is blocking the drain line. A slow drain often leads to standing water and foul smells.
Run a cleaning cycle: Every month, run an empty cycle with dishwasher cleaner, white vinegar, or baking soda to break down grease and kill bacteria.
Air it out: Leave the door slightly open after a cycle so the inside can dry fully. This simple habit goes a long way in preventing mildew.
Scrape dishes first: You don’t need to pre wash, but removing larger food scraps prevents buildup inside the machine.

Extra Tips for Freshness

Drop a slice of lemon or a few drops of essential oil (like lemon or eucalyptus) on the bottom rack before a cycle for a natural fresh scent.
Inspect the rubber door seal. If mold or grime collects there, wipe it with a mild vinegar solution.
If smells persist even after cleaning, check the garbage disposal (if your dishwasher drains through it) since odors can travel back up the hose.

Bottom line: A smelly dishwasher isn’t a sign you need a new machine, it’s a signal that it needs a little maintenance. By keeping filters clean, running occasional cleaning cycles, and letting the interior dry out, you can ensure your dishwasher stays as fresh as the dishes it washes.