Baking Soda in Laundry: 5 Proven Ways to Boost Every Load

What Does Baking Soda Do for Laundry?

Baking soda is sodium bicarbonate, a mild base. University of Missouri food scientist Ruojie Vanessa Zhang, speaking to Simply Recipes, puts it at about pH 9 and vinegar at about pH 2. Green Cleaning Coach founder Leslie Reichert points out that sweat, urine and vomit odors are acidic, which is exactly the kind of smell a base neutralizes instead of masking.

Arm & Hammer makes a second claim in its own laundry instructions for baking soda: that it softens wash water so detergent and bleach work harder. Treat that one with more caution. Consumer Reports laundry expert Rich Handel told Consumer Reports’ laundry additives review it may help in hard water, and said of the odor claims, “we have not tested this.”

That gap between manufacturer claims and independent testing is the honest answer to what does baking soda do for laundry. The table below splits the jobs it reliably handles from the ones it gets credited with online.

If that last row is your real problem, skip ahead to our roundup of the best stain remover for old set-in stains instead of adding more powder.

How to Use Baking Soda in Laundry, Step by Step

Learning how to use baking soda in laundry is more about order than amount. Most of the bad results in Amazon reviews of laundry powders trace back to where the powder went and what went in with it.

1. Load the clothes first. Arm & Hammer’s own sequence puts clothes in the washer before the baking soda. Dry powder poured onto an empty drum and then buried by dark fabric is how chalky streaks happen.
2. Sprinkle it into the drum, not the detergent drawer. Leslie Reichert advises against the dispenser, and a drawer built for liquid can leave powder caked in the corners instead of flushing it into the wash.
3. Pre-dissolve it for cold washes. Stir the half cup into a quart of warm water and pour that in. Undissolved grit on dark clothes is the single most repeated complaint in critical reviews of powdered laundry products.
4. Add your normal detergent dose. Baking soda isn’t a surfactant, so it won’t lift oily soil the way detergent does. Arm & Hammer frames it as a booster for whatever detergent you already use.
5. Add a second half cup at the rinse if your washer lets you pause and add. If it doesn’t, skip this step. Softener dispensers are designed for liquids, so check your manual before putting powder in one.
6. Keep vinegar out of the same cycle. Vinegar and baking soda in laundry cancel each other out, and the FAQ below explains why.

Baking Soda in Laundry for Top-Load, Front-Load and HE Washers

Cleaning author Becky Rapinchuk, founder of Clean Mama, told Southern Living that baking soda is safe in both traditional and high-efficiency machines. The answer to how much baking soda for laundry stays the same across machine types, but water volume doesn’t. An HE front-loader uses far less water to dissolve powder, so the pre-dissolve step in cold cycles matters more there than in a deep top-loader.

Shared laundry rooms in apartment buildings add one more wrinkle. You often can’t pause a coin-op machine, so if you’re using baking soda in a washing machine you don’t control, put the full half cup in the drum at the start and skip the rinse dose.

Baking Soda Laundry Detergent vs a Box of Plain Baking Soda

ARM & HAMMER Powder Laundry Detergent’s Amazon ingredient list starts with sodium carbonate, which is washing soda. Sodium bicarbonate, the baking soda, comes fourth, after water and a surfactant. So the product sold on “activated baking soda” gets most of its alkaline push from the stronger compound.

That changes the math for anyone already using it. Adding a half cup of plain baking soda on top of a baking soda laundry detergent roughly multiplies the per-load cost by eight for a milder version of an ingredient that’s already in the scoop.

I’d save plain baking soda in laundry for targeted jobs, like a rinse-cycle dose for towels or a stain paste. Buy the detergent if you want baking soda in every load without measuring anything.

Where Washing Soda and Borax Fit

These three powders look alike but sit at very different strengths. Twenty Mule Team’s own borax vs washing soda comparison puts washing soda at pH 11 and warns it shouldn’t touch bare skin. The same page describes borax as strongly alkaline, though not to washing soda’s level.

For borax specifically, Poison Control’s borate safety guidance calls it particularly hazardous if swallowed by children or pets, and notes it can irritate skin and eyes. Store all three powders sealed and up high.

Full Reviews: 4 Laundry Boosters Compared

Buyer volume shows which products people actually reorder, and for baking soda in laundry routines the clear leader isn’t baking soda at all. Super Washing Soda moves the most units by a wide margin.

1. ARM & HAMMER Baking Soda, 2.7 Lbs

The listing describes pure, food-grade sodium bicarbonate with no additives, cornstarch or fragrance, made in Green River, Wyoming. Baking soda in laundry is one of its listed uses, and the resealable bag matters more than it sounds in a humid laundry room.

Buyers praise its versatility across laundry, deodorizing and cleaning, and 88% of ratings are five stars. Critical reviews rarely fault the powder itself, pointing instead to bags torn in shipping and warehouse stores that sell it cheaper.

2. Arm & Hammer Super Washing Soda

This is sodium carbonate, fragrance-free and phosphate-free. The listing claims it improves liquid detergent performance by up to 15%, but the footnote limits that to mustard and blood stains measured against a leading value detergent alone. Read it as a stain-specific claim, not a general one.

Amazon’s review summary credits it with brighter whites and removing cigarette odor. Some four-star buyers saw little difference in their whites, and a few call the pour spout messy.

One safety note belongs up front. A two-star reviewer who followed a social media tip to pour it down a drain reported, “It turns into cement,” and had to replace pipes. Keep it in the washer, and wear gloves when you scoop it, as the Twenty Mule Team comparison page advises for washing soda.

3. 20 Mule Team Borax Detergent Booster, 65 Oz.

The listing says it softens hard water, improves detergent cleaning power, and is safe in standard and HE machines. Its label cautions, shown on the listing, are to avoid eye contact, keep it away from children, and not swallow it.

Buyers like that it’s fragrance-free, cheap per ounce and useful for whites. Nearly every critical review is about crushed boxes spilling powder in the shipping carton. One reviewer also reported the four-pack price more than doubling between June and August 2026, so check the current price before you stock up.

4. ARM & HAMMER Powder Laundry Detergent, Alpine Clean, 9.56 lb

This is the pick for people who want baking soda in laundry without a measuring cup, and it’s the only baking soda laundry detergent in this lineup. Its listed ingredients include sodium bicarbonate, though sodium carbonate comes first.

Buyers call it an economical choice for big households, but the critical reviews are specific. Several report white residue or splotchy, faded dark clothes, mostly when the powder was poured straight onto fabric.

A smaller group reports rashes or itching with the scented version, which is a real safety signal for anyone with sensitive skin.

If anyone in your home has sensitive skin, the same line’s ARM & HAMMER Powder Laundry Detergent, Free of Perfume and Dyes (6.16 lb, $15.00 on September 24, 2026) is listed as dermatologist tested. Either way, add the powder to the drum before the clothes go in.

When Baking Soda in Laundry Falls Short

The detergent draws the most complaints of the four, at 6% of ratings in the one-to-three-star range. That’s still a small share, and the complaints point to how it’s used more than to what’s in it.

If you’re still asking what does baking soda do for laundry beyond odor, the situations below are where the honest answer is “not much.”

The laundry room itself needs attention too. Wipe the washer’s gasket and lid with a spray from our best all purpose cleaner picks, since powder dust and damp lint collect there. If a washer overflows, a wet/dry vac pulls water off the floor far faster than towels, which is where our shop vac built for garage cleanup guide and the rest of our vacuums and floor care reviews come in.

Baking Soda in Laundry: Common Questions

Can you use baking soda instead of laundry detergent?

Only in a pinch, and only for lightly soiled loads. The Spruce suggests 1 cup of baking soda in place of detergent, but baking soda isn’t a surfactant, so it won’t lift oily soil the way detergent does.

• Fine for lightly worn clothes that mostly need freshening.
• Poor for greasy work clothes, heavy soil and set-in stains.

Is baking soda safe for HE and front-load washers?

Yes. Clean Mama founder Becky Rapinchuk told Southern Living that baking soda is safe in both traditional and high-efficiency machines, and Maytag recommends checking your owner’s manual before adding it.

• Put it in the drum, not the detergent drawer.
• Pre-dissolve it for cold cycles, since HE machines use less water.

Can you mix baking soda and vinegar in the same load?

You can, but you shouldn’t expect much from it. Baking soda is a base and vinegar is an acid, so they neutralize each other, and The Conversation’s chemistry explainer describes the fizz as a visual placebo rather than cleaning power.

• Baking soda goes in the wash, where it works on odor.
• Vinegar, if you use it, belongs in a separate rinse after the wash water drains.