How to Use Baking Soda to Deodorize a Washing Machine

A stale or musty washer often contains trapped detergent, fabric softener, lint, and moisture. Baking soda can neutralize some of those odors and loosen light residue. It works best as part of a full cleaning process rather than as a substitute for cleaning the gasket, detergent drawer, filter, and drum.

The basic method is simple: add 1/4 to 1/2 cup of baking soda to an empty washer, run a hot cleaning cycle, and dry the machine afterward.

Essential Concepts

• Add 1/4 to 1/2 cup baking soda directly to the empty drum.
• Run the washer’s cleaning cycle or the hottest permitted empty cycle.
• Clean the gasket, dispenser, and filter separately.
• Baking soda controls odors but does not disinfect the washer.
• Never combine baking soda treatments with chlorine bleach or other cleaners.

Why Washing Machines Develop Odors

Washer odors usually come from damp organic residue. Body oils, soil, lint, detergent, and fabric softener can collect in places that receive little airflow. Bacteria and fungi then grow on the residue, producing sour or musty smells.

Front-loading machines are particularly susceptible because water can remain inside the rubber door gasket. High-efficiency washers may also develop residue when too much detergent is used. These machines consume less water, so excess detergent may not rinse away completely.

Other common sources include:

• A clogged or stagnant drain-pump filter
• Liquid fabric softener coating the dispenser or drum
• Wet laundry left in the machine for several hours
• A partially blocked drain hose
• Repeated use of cool cycles without periodic drum cleaning

A sewage-like smell may indicate a plumbing or drainage problem rather than a dirty drum. Baking soda will not repair an incorrectly installed drain hose, dry plumbing trap, or blocked drain.

How Baking Soda Controls Washer Odor

Baking soda, or sodium bicarbonate, is a mildly alkaline compound. It can neutralize certain acidic odor molecules and reduce the smell produced by light detergent and soil deposits. Its fine particles also provide mild scouring action when used as a paste.

These properties make baking soda laundry cleaning useful for routine odor control. Its limitations are equally relevant. Baking soda is not an EPA-registered disinfectant, and an ordinary wash cycle does not make it one. It may reduce odor without removing established microbial films or mildew stains.

Persistent odors require physical cleaning. Detergent residue hidden beneath a gasket or inside a filter must be removed rather than merely deodorized.

How to Clean a Washing Machine With Baking Soda

Check the appliance manual before beginning. Some manufacturers instruct owners to use a specific cleaning product or prohibit additives during the self-clean cycle.

1. Empty and Inspect the Washer

Remove all clothing and check the drum for coins, tissues, or other debris. Inspect the gasket, dispenser, and filter area for visible residue.

Front-load washers often collect hair, lint, and small objects beneath the folds of the door seal. Wear gloves if the area contains dark slime or mildew.

2. Add the Baking Soda

Place 1/4 to 1/2 cup of baking soda directly into the empty drum. Do not pack the powder into a narrow liquid-detergent compartment, where it may clump or obstruct the dispenser.

Use the smaller quantity for compact machines. More baking soda does not necessarily produce better washing machine odor removal. Excess powder can remain behind if the machine uses little water or has poor drainage.

3. Run an Empty Hot Cycle

Select the machine-cleaning cycle if the manual permits baking soda during that program. Otherwise, use the hottest and longest empty cycle approved for the appliance.

Hot water softens greasy detergent deposits better than cold water. Machines connected only to cold water may need a commercial washer cleaner formulated for low-temperature use.

4. Clean the Gasket and Dispenser

Mix a small amount of baking soda with enough water to form a thin paste. Apply it to washable residue with a soft cloth. Avoid aggressive scrubbing, which can roughen rubber seals and create new places for soil to collect.

Remove the detergent drawer if the manual provides instructions. Wash it with warm water and a small amount of dish soap, rinse it, and let it dry.

5. Check the Drain-Pump Filter

Many front-load washers have a service filter near the bottom of the machine. Follow the manufacturer’s directions because opening the filter can release retained water. Place towels and a shallow pan beneath the access panel.

Remove lint, hair, and foreign objects. A dirty filter can cause slow drainage and recurring smells even after the drum has been cleaned.

6. Dry the Washer

Wipe the drum and gasket with a dry cloth. Leave the door and detergent drawer open until the interior has dried, provided children and pets cannot access the machine.

Mistakes That Can Make Odors Worse

Mixing multiple cleaners creates avoidable risks. Never use chlorine bleach in the same treatment as vinegar, ammonia, or other household cleaners. Chlorine bleach and acids can release toxic chlorine gas; bleach and ammonia can form hazardous chloramine gases.

Baking soda and vinegar are sometimes recommended together. Their reaction produces carbon dioxide, water, and sodium acetate. The fizz may loosen exposed debris, but the acid and alkali largely neutralize each other. Separate cleaning steps are usually more effective, assuming the appliance manufacturer permits both substances.

Too much laundry detergent also contributes to washer smells. Use the quantity listed for the load size, soil level, water hardness, and machine type. High-efficiency washers require detergent marked “HE.”

Habits That Keep a Washer Fresher

Effective washing machine cleaning tips focus on moisture and residue:

• Remove wet laundry soon after the cycle ends.
• Let the drum and dispenser dry between loads.
• Wipe a front-loader gasket regularly, including beneath its folds.
• Clean the drain-pump filter at the interval stated in the manual.
• Measure detergent rather than filling the cap automatically.
• Run the manufacturer’s cleaning cycle about monthly, or as directed.

Routine care can freshen a washing machine before heavy deposits develop. A baking soda washing machine treatment may be used occasionally, but repeated odor often signals residue or drainage trouble that needs direct attention.

FAQ

Can baking soda damage a washing machine?

Moderate amounts are generally compatible with many washers, but appliance instructions take priority. Undissolved powder may collect in dispensers, hoses, or low-water machines, so add it to the drum and avoid excessive quantities.

Can baking soda be added to every laundry load?

A small amount is sometimes used to control laundry odors, but it is rarely needed in every load. Frequent use may leave mineral residue, especially in hard water or during short, cool cycles.

Will baking soda remove black mildew from a washer gasket?

Baking soda may remove surface residue and reduce odor, but black staining can remain. Deeply embedded growth, cracked rubber, or recurring slime may require a manufacturer-approved cleaner, professional service, or gasket replacement.

Why does the washer still smell after cleaning?

Check the gasket, dispenser, drain-pump filter, drain hose, and household drain. Slow drainage, standing water, plumbing gases, or hidden residue can cause smells that drum cleaning cannot correct.