How to Clean a Dishwasher and Get Rid of Bad Smells?

It is easy to assume that a machine designed to wash dishes is constantly cleaning itself. However, over time, hidden food particles, grease, hard water minerals, and soap scum accumulate inside the appliance. When these organic materials trap moisture, your dishwasher can quickly develop a foul, musty odor that transfers right back onto your supposedly clean glassware and plates.



Knowing how to deep-clean your dishwasher, clear the filter, and neutralize odors restores maximum cleaning performance and keeps your kitchen smelling fresh.

Quick answer: the best way to clean a smelly dishwasher

If your dishwasher smells unpleasant or fails to clean dishes effectively, resolve it with these key maintenance steps:

• Empty the Filter: Remove and wash out the lower food trap filter where decomposed scraps collect.
• Wipe the Gasket: Scrub down the rubber door seals and hidden frame edges where mold thrives.
• Clear Spray Arms and Run a Cycle: Unclog mineral deposits from the spray arms and run a hot maintenance cycle using a specialized cleaner or white vinegar.

Why dishwashers start to smell

Food debris in the filter

Despite scraping plates, tiny bits of rice, vegetable peels, and food pulp slip past the drain and get trapped in the cylindrical mesh filter at the bottom of the tub.

Grease and soap residue

Congealed cooking fats, butter, and heavy detergent film coat the interior walls and interior pump lines, creating a sticky breeding ground for bacteria.

Standing water or poor drainage

If a small pool of water continuously sits at the bottom of the tub after a cycle finishes, it usually points to a clogged drain line or an obstructed air gap.

Dirty door seals and hidden edges

The soft rubber gasket surrounding the door opening misses the direct stream of washing water, making it a hotspot for black mold and mildew.

Step-by-step dishwasher cleaning routine

Remove racks and inspect the bottom

Pull out the bottom and top dish racks completely to get unobstructed access to the floor and base of the tub.

Clean the dishwasher filter

Locate the filter at the base of the lower spray arm. Twist and lift it out, take it to the sink, and scrub away grease and trapped particles using warm soapy water and a soft brush before clicking it securely back into place.

How often to clean the filter in busy kitchens

In busy households that run the dishwasher daily, the filter should be inspected and cleaned at least once a month to prevent foul odors and poor drainage.

Wipe the gasket, door frame, and detergent cup

Dip a cloth into warm soapy water and thoroughly wipe down the entire rubber door perimeter, the inner door frame, and the sticky residue inside the detergent dispenser cup.

Clear spray arm holes carefully

Examine the tiny water jets along the upper and lower rotating spray arms for mineral scale or trapped food bits.

Use a soft brush or toothpick without damaging the arm

Poke a wooden toothpick or use a soft-bristled brush to gently clear out any blocked spray holes so water can circulate freely.

Run a cleaning cycle with a dishwasher-safe cleaner

Place a cup of white vinegar upright on the top rack and run a hot water cycle to cut through grease and neutralize odors. Alternatively, place a specialized dishwasher cleaner tablet on the floor of the machine and run a heavy-duty hot cycle.

How to prevent dishwasher odors

• Scrape Food Before Loading: Avoid pre-rinsing dishes entirely (modern enzymes need food to cling to), but always scrape away large solid bones and heavy food scraps.
• Leave the Door Cracked After a Cycle When Safe: Prop the door open slightly once a cycle finishes to allow trapped humidity to escape and the interior to air dry.
• Clean Monthly as Part of Kitchen Maintenance: Incorporate a monthly filter check and vinegar rinse into your routine. (For complementary odor-fighting habits around your cooking space, see our guide on how to clean a kitchen sink and remove odors).

When professional cleaning helps

Recurring kitchen cleaning for sinks, counters, appliance exteriors, and odor-prone areas

While internal appliance filters and deep mechanical components require hands-on upkeep, keeping your broader kitchen environment immaculate takes consistent effort. Partnering with a professional recurring house cleaning service ensures that your kitchen sinks, countertops, appliance exteriors, and hidden floor corners stay sanitary, spotless, and entirely fresh.

FAQ

Why does my dishwasher smell bad?

Your dishwasher smells bad because food particles, grease, and soap scum accumulate in the bottom filter and spray arms, feeding bacteria in a warm, moist environment.

How often should I clean a dishwasher filter?

You should remove and clean your dishwasher filter at least once a month. If you run multiple loads daily or don't scrape plates thoroughly, check it every two weeks.

Can vinegar clean a dishwasher?

Yes. Placing a bowl of white vinegar on the top rack during a hot cycle effectively cuts through grease, dissolves hard water mineral deposits, and neutralizes bad odors.

Why are my dishes still dirty after washing?

Dishes often come out dirty when the spray arm holes are clogged with mineral scale, the bottom filter is blocked with debris, or the water heater isn't supplying hot enough water to activate your detergent.