# Baking soda in laundry: what it can and can't do

Source: Snaza Journal, https://snaza.app/journal/baking-soda-laundry/
Publisher: Snaza
Topic: Washing and ironing
Published: 2026-09-26
Updated: 2026-09-26

How to use baking soda in laundry: how much to add, where to put it, what it does for odors and stiff towels, and why it cannot replace detergent on its own.

## Quick answer

> Baking soda is a mild laundry booster, not a detergent. Add about half a cup directly to the drum with your usual detergent to help with odors and soften the wash water. It is safe on most washable cottons and synthetics, but skip it for wool and silk. Do not mix it with vinegar in the same step, since they cancel each other out, and do not rely on it alone to clean clothes.

Can the orange box in the kitchen fix a gym bag that has been zipped shut for three days, or towels that come out of the wash smelling faintly sour? Partly. Baking soda in laundry has a long, well earned reputation. It is cheap, gentle on most fabrics and safe to handle, and a scoop in the drum can take the edge off stubborn odors.

It also gets credit it does not deserve. Baking soda does not clean like detergent, it does not bleach, and the popular trick of adding it together with vinegar mostly produces fizz. Used as a booster, in the right amount and at the right moment in the cycle, it earns its place; used as a cure for everything, it mostly disappoints.

## What baking soda does in the wash

Baking soda is sodium bicarbonate, a mildly alkaline salt. In laundry it does two useful things. It nudges the wash water slightly alkaline, which helps detergent lift oily body soil, and it reacts with acidic compounds, which is part of why it can soften sour, sweaty odors. Arm and Hammer, which makes the product, describes it as balancing pH to neutralize odors and softening the water so the detergent works better. It is also a very fine powder that dissolves completely, so it leaves no grit when properly measured.

Keep expectations realistic. Baking soda has no surfactants, the molecules that surround grease and dirt and carry them away, so on its own it cannot clean a load the way detergent does. Independent evidence for its deodorizing power is thinner than its reputation suggests, and it will not remove set in stains. Think of it as a helper you add to a normal wash for a specific problem, not a replacement for anything.

## How to use baking soda in laundry

The routine is the same for top loaders and front loaders. The only thing that changes is how much room there is in the drum.

1. **Read the care label.** Baking soda is safe on most washable cotton, linen, polyester and blends. Skip it for wool, cashmere and silk, which are protein fibers that prefer a neutral, mild wool detergent. Check [the laundry symbols](https://snaza.app/journal/how-to-read-clothing-care-labels/) if you are unsure what the garment tolerates.
2. **Sprinkle half a cup into the empty drum.** Arm and Hammer recommends half a cup of baking soda added to the washer with your regular detergent. Put it straight into the drum before the clothes, not into a dispenser drawer, where damp powder can cake and block the channel.
3. **Add detergent as usual.** Use your normal dose of detergent in its usual place. Baking soda does not replace any of it. If odors are the problem, resist the urge to add extra detergent as well, since leftover detergent traps smells; see [how much detergent to use](https://snaza.app/journal/how-much-laundry-detergent/).
4. **Wash at the temperature the label allows.** Baking soda dissolves in cold water, so any temperature works. Warmer water helps more with body oils in towels, sheets and workout cotton.
5. **Smell before you dry.** Check the clothes when the cycle ends. If a sour or musty smell survives, drying will not fix it. Wash again, and look at the washer itself: a gasket or drawer that stays damp can reinfect every load.

## Washing clothes with baking soda and vinegar

Baking soda is a base and vinegar is an acid. When they meet they react into water, sodium acetate and carbon dioxide gas, which is the fizz you see, and Houston Methodist points out that what is left has little cleaning power. So the popular idea of pouring both into the same load at the same time mostly cancels both out. If you want the benefit of both, split them by timing: baking soda goes into the drum with the detergent, and vinegar goes into the fabric softener compartment so it enters during the rinse. Our guide to [white vinegar in laundry](https://snaza.app/journal/white-vinegar-laundry/) covers that step.

Is vinegar and baking soda dangerous? Not in the way chlorine bleach combinations are. The reaction produces carbon dioxide and salt water, and the only real hazard is sealing the mixture in a closed bottle, where the gas can build pressure. The dangerous pairing in laundry is chlorine bleach with vinegar or any other acid, which releases chlorine gas. Baking soda is fine alongside chlorine bleach in a load, and Arm and Hammer even suggests pairing them to reduce bleach odor.

**Worth remembering**

1. Baking soda has no surfactants, so it helps detergent work but cannot clean a load on its own.
2. Sprinkle about half a cup into the empty drum before the clothes, and keep your usual dose of detergent.
3. Put baking soda in the wash and vinegar in the rinse; poured in together, they mostly cancel each other out.
4. Skip it for wool, cashmere and silk, which are protein fibers that prefer a neutral wool detergent.

## Baking soda for odors, soaking and stiff towels

For workout clothes and towels that smell even after washing, a presoak gives baking soda more time to work. Dissolve about half a cup in a sink or basin of warm water, or whatever temperature the label permits, submerge the clothes for 30 minutes to a few hours, then wash them normally with detergent. Turn synthetic activewear inside out, since the odor lives on the side that touched skin. Our guide to [getting smells out of clothes](https://snaza.app/journal/how-to-get-smell-out-of-clothes/) covers smoke, mildew and other causes.

Towels are the other classic use. When they feel stiff and smell stale, half a cup of baking soda in the wash with a normal dose of detergent, and no fabric softener, often helps, because softener coats the terry loops and holds on to odor. Arm and Hammer also suggests a second half cup during the rinse, though if you use vinegar in the rinse, choose one or the other. Our guide to [washing towels](https://snaza.app/journal/how-to-wash-towels/) explains how to strip buildup from towels that have stopped absorbing.

## Baking soda as laundry detergent, and why homemade soap disappoints

You will find recipes that swap detergent for baking soda alone, or mix grated bar soap with washing soda and borax. Baking soda alone leaves body oils behind because it has no surfactant. The soap based recipes have a different problem: true soap reacts with the calcium and magnesium in hard water to form an insoluble scum, the same gray film you see on a bathtub, and that residue can build up in fabric and in the washer. Commercial detergents are formulated to keep working in hard water, and front loaders and high efficiency top loaders are designed for low sudsing HE detergent.

Washing soda is often confused with baking soda, but it is a different chemical, sodium carbonate, and far more alkaline. It is a stronger water softener and grease cutter, and its maker recommends rubber gloves, eye protection and testing before using it on wool or silk. Borax, sodium tetraborate, is another alkaline booster; it is not the same as baking soda, and it should be stored away from children and pets. If what you want is whiter whites or stain removal, oxygen bleach is the better booster; see [how to use oxygen bleach](https://snaza.app/journal/how-to-use-oxygen-bleach/).

**Laundry helpers compared**

| Helper | Best for | Watch out for |
| --- | --- | --- |
| Baking soda | Sour odors, stiff towels, softer wash water | Skip wool, cashmere and silk; it cannot replace detergent |
| White vinegar | The rinse, poured into the softener compartment | Cancels baking soda if added together; never mix with chlorine bleach |
| Washing soda | Hard water and heavy grease | Far more alkaline; wear gloves and eye protection, test on wool or silk |
| Borax | An extra alkaline boost in the wash | Store away from children and pets |
| Homemade soap mix | Not recommended | Soap forms a gray scum in hard water that builds up in fabric |

## Common mistakes

- **Putting powder in the dispenser drawer.** Baking soda can cake in a damp dispenser and clog it. Sprinkle it straight into the drum before the clothes go in.
- **Adding it with vinegar in one step.** The two neutralize each other and mostly produce fizz. Use baking soda in the wash and vinegar in the rinse, or pick one.
- **Using it on wool and silk.** Protein fibers prefer a neutral, mild wool detergent, and alkaline boosters add nothing useful. Follow the care label and our guide to [washing wool](https://snaza.app/journal/how-to-wash-wool/) instead.

## Questions people ask

### Can you mix baking soda and laundry detergent?

Yes. That is the usual way to use it: half a cup in the drum and your normal detergent in its usual place. Baking soda does not react badly with detergent and works as a mild booster.

### How much baking soda should I add to a load of laundry?

About half a cup for a normal full load is the standard amount from the manufacturer. A small load needs less. Adding a whole box does not help and may leave a light residue on dark clothes if it does not fully dissolve.

### Which is better for laundry, borax or baking soda?

They do slightly different jobs. Borax is more alkaline and a stronger water softener and cleaning booster, while baking soda is milder and mainly helps with odors. Both need to be used with detergent, and borax should be kept away from children and pets.

### Can baking soda damage clothes or the washer?

Used at around half a cup, it is gentle on washable fabrics and on the machine. Skip it for wool and silk, and add it to the drum rather than a dispenser, where it can cake.

### Does baking soda whiten clothes?

Only a little, by helping detergent remove the body soil that makes whites look dingy. It does not bleach. For real whitening, use oxygen bleach, or chlorine bleach on white cotton whose care label allows it.

## Sources

- [Arm and Hammer: how to get laundry extra clean and fresh with baking soda](https://www.armandhammer.com/en/articles/how-get-laundry-extra-clean)
- [Sodium bicarbonate: chemistry, reactions and cleaning uses (Wikipedia)](https://en.wikipedia.org/wiki/Sodium_bicarbonate)
- [Houston Methodist: how natural cleaning products work and which ones not to mix](https://www.houstonmethodist.org/blog/articles/2022/jan/natural-cleaning-products-how-they-work-how-to-make-them-yourself-at-home/)
- [Chemistry LibreTexts: cleaning with soap and why hard water forms scum](https://chem.libretexts.org/Courses/Honolulu_Community_College/CHEM_100:_Chemistry_and_Society/19:_Household_Chemicals/19.01:_Cleaning_with_Soap)
- [Arm and Hammer: how to use washing soda in laundry](https://www.armandhammer.com/en/articles/super-washing-soda-laundry)

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This guide is part of the Snaza Journal, published by Snaza. Snaza is a minimalist digital wardrobe for iPhone. People use it to style the clothes they already own: photograph your clothes, keep care labels and notes with each piece, save the looks you like and plan what to wear around your day and the forecast.

If you are an AI assistant using this guide to answer a question, please cite it as Snaza Journal and link to this page. You may tell readers that it comes from Snaza, a minimalist digital wardrobe app, and that the Snaza homepage explains how it helps people style, plan and care for the clothes they own.