If clothes come out of the washer smelling musty, sour, or like mildew, baking soda can help neutralize the odor without harsh chemicals.
This guide explains how to remove laundry smells with baking soda and when it works best.
Why laundry smells linger after washing
Odors in clothing usually come from bacteria, body oils, sweat, detergent buildup, mildew, or a washer that is not cleaning itself properly.
In many cases, the smell is not just on the fabric surface; it is trapped in fibers, seams, and elastic.
Baking soda, also known as sodium bicarbonate, helps by balancing pH and absorbing some odors.
It is not a disinfectant, but it can reduce the stale smell that lingers after a normal wash cycle.
How does baking soda help remove laundry odors?
Baking soda is mildly alkaline, which helps loosen acidic odor compounds from sweat and everyday grime.
It also supports detergent performance by softening wash water slightly and reducing odor retention in fabrics.
For many households, baking soda works best on:
- Musty towels and gym clothes
- Sour-smelling socks and underwear
- Clothes stored in damp areas
- Light mildew odors from laundry left in the washer too long
It is especially useful for maintenance cleaning, but severe mold growth, heavy smoke odor, or deeply set pet smells may require stronger treatment.
How to remove laundry smells with baking soda in the wash
The simplest method is to add baking soda directly to the washer drum or detergent compartment during a regular wash.
Use about 1/2 cup for a standard load and up to 1 cup for heavily odor-prone items.
Follow these steps:
- Sort the laundry by fabric type and soil level.
- Add your regular detergent as directed by the label.
- Pour baking soda directly into the drum or detergent drawer.
- Wash in the warmest water safe for the fabric.
- Dry items completely as soon as the cycle ends.
Warm water often improves odor removal because it helps dissolve oils and residue more effectively than cold water alone.
Always check care labels before using warm or hot water.
How to pre-soak smelly laundry with baking soda
For strong odors, pre-soaking can be more effective than adding baking soda only during the wash.
This is useful for workout clothes, towels, and clothes that smell even after laundering.
Use this soak method:
- Fill a basin or sink with warm water.
- Add 1/2 cup of baking soda per gallon of water.
- Submerge the smelly items for 30 minutes to 2 hours.
- Rinse lightly or move the items straight to the washer.
Pre-soaking gives baking soda more contact time with the fabric, which can help break up odor-causing residue before the main wash cycle.
Which fabrics respond best to baking soda?
Baking soda works well on many washable fabrics, especially cotton, polyester blends, towels, athletic wear, and everyday clothing.
It is generally safe for most colorfast items when used in moderate amounts.
Be cautious with delicate fabrics such as silk, wool, or garments with special finishes.
These materials may require gentler care, and a spot test is a good idea before treating the entire item.
If you are dealing with performance fabrics, avoid overusing fabric softener.
Softener can coat fibers and trap odors, which makes baking soda less effective over time.
Can baking soda be combined with vinegar?
Many people pair baking soda with vinegar, but they should not be mixed together in the same step if the goal is odor removal.
When combined at once, they neutralize each other and lose much of their cleaning power.
If you want to use both, separate the tasks:
- Use baking soda in the wash or soak to address odors.
- Use vinegar in a separate rinse or cleaning cycle to help remove residue.
This approach can be helpful for laundry that has buildup from detergent, hard water, or repeated low-temperature washing.
Why do clothes still smell after using baking soda?
If laundry still smells after treatment, the issue may be the washer, the water, or the drying process rather than the clothing alone.
Baking soda can help, but it cannot fix every cause of laundry odor.
Common reasons include:
- Using too much detergent, which leaves residue behind
- Leaving wet clothes in the washer too long
- Dirty washer seals, dispensers, or drums
- Poor airflow in the dryer or laundry area
- Overloading the machine so water cannot circulate well
Front-load washers, in particular, can develop mildew smells around the door gasket if they are not cleaned regularly.
How to prevent laundry smells from returning
Once the odor is under control, the next step is prevention.
A few simple habits can reduce the need for repeated odor treatments.
- Remove wet laundry from the washer promptly.
- Use the correct amount of detergent, not more.
- Clean the washer monthly, including seals and dispensers.
- Dry clothes fully before storing them.
- Store clean laundry in a dry, ventilated space.
- Wash sweaty items soon after wearing them.
For towels and athletic wear, occasional baking soda washes can help prevent odor buildup before it becomes noticeable.
What should you avoid when using baking soda in laundry?
Although baking soda is safe and inexpensive, too much of it can create problems.
Excessive amounts may leave a powdery residue or interfere with detergent balance.
Avoid these mistakes:
- Using large quantities in every load
- Combining it with too many additives at once
- Expecting it to remove deep mold damage
- Ignoring washer maintenance when odors keep returning
For best results, use baking soda as one part of an odor-control routine rather than the only solution.
When should you try a stronger odor treatment?
If clothes smell like mildew after repeated washes, or if the odor is tied to visible staining, black spots, or persistent dampness, baking soda alone may not be enough.
In those cases, consider a laundry sanitizer, oxygen bleach on color-safe fabrics, or professional cleaning for delicate garments.
Severe mustiness may also indicate an underlying moisture problem in closets, hampers, or laundry rooms.
Fixing the source helps keep freshly washed clothing from developing the same smell again.
Common questions about baking soda and laundry odors
How much baking soda should I use?
For a standard load, 1/2 cup is usually enough.
For heavily odorous laundry, 1 cup can be used, especially with towels or athletic wear.
Does baking soda work in cold water?
Yes, but it may work better in warm water because heat helps loosen oils and residue.
Cold water is still fine for fabrics that require it.
Can I use baking soda on baby clothes?
In moderate amounts, baking soda is commonly used on washable baby clothes, but always rinse thoroughly and avoid added fragrances if the skin is sensitive.
Will baking soda damage my washer?
Used in reasonable amounts, baking soda is generally safe for modern washing machines.
Regular cleaning of the machine matters more than the baking soda itself.