7 Laundry Mistakes That Make Towels Smell Sour (and the Fix for Each)

Every tip here is checked against the sources listed at the bottom.

A laundry room with a washer, dryer and a basket of towels

The short answer

What works Wash towels in the hottest water the care label allows, measure your detergent, skip fabric softener, and get towels dry fast and all the way. If they already smell sour, give them one reset first.

The reset
Boil white 100% cotton towels for 15 minutes in a stainless or enamel pot with 2 tablespoons of washing soda per gallon of water. For colored towels or no big pot, use the hottest wash the label allows with oxygen bleach powder and your usual detergent.
How long
The reset takes about an hour with cooling time. The habits take no extra time at all.
What it costs
A 55 oz box of Arm & Hammer Super Washing Soda was $5.43 at Walmart.com on November 6, 2026, and a reset uses only a few tablespoons.
What you need
Washing soda or oxygen bleach powder, a big stainless or enamel pot, tongs and gloves.
See the 7 mistakes
From your cabinet

The 7 mistakes

  1. Rewashing a sour towel on a quick, cold cycle
  2. Pouring in extra detergent
  3. Adding fabric softener to towels
  4. Letting towels stay damp
  5. Stuffing the washer too full
  6. Forgetting the washer can be the smell
  7. Mixing your fixers in one load
  1. Rewashing a sour towel on a quick, cold cycle

    Why it backfires. A quick, cold wash feels like the gentle choice. But a review of laundry studies found that frequent cold, short washes do not clear out the bacteria, skin oils and smelly compounds that build up in fabric. Washes at about 122°F (50°C) and up generally do. (On a care label, “hot” means water from 112°F to 145°F, set by the FTC.)

    Do this insteadWash towels in the hottest water their care label allows. If a towel already smells sour, do the one-time reset first. The same old wash will just bring the same old smell back.

    Full tip: How to get the sour smell out of towels

  2. Pouring in extra detergent

    Why it backfires. Speed Queen, a washer maker, says soap residue builds up in towels, keeps them from drying well and can leave them musty. If you still see suds after the rinse, that is a sure sign you used too much.

    Do this insteadMeasure your detergent by the line on the package instead of pouring by eye. If you have an HE (high efficiency) washer, use HE detergent.

  3. Adding fabric softener to towels

    Why it backfires. It seems like softener should make towels softer. But Speed Queen says it builds up on towels and makes them less soft over time, which is the opposite of what you paid for.

    Do this insteadLeave the softener out of towel loads. Your other laundry can follow its own label.

  4. Letting towels stay damp

    Why it backfires. The laundry research review found that slow drying leaves more bacteria on fabric, while fast drying and tumble drying cut it down. So a wet towel balled up in the hamper, or a load left sitting in the washer, gives the smell a head start.

    Do this insteadHang towels open between uses, and never throw a wet one in the hamper. Move a finished load to the dryer or the line right away, and make sure the towels are dry all the way through before you fold them.

    Full tip: How to get the mildew smell out of clothes left in the washer

  5. Stuffing the washer too full

    Why it backfires. The American Cleaning Institute says clothes need room to move in the washer. It also lists mixing bath towels with sweaters and flannels as a cause of lint.

    Do this insteadLeave room for the load to tumble, and wash towels with other towels.

    Full tip: How to get the sour smell out of towels

  6. Forgetting the washer can be the smell

    Why it backfires. Clean towels can pick up a smell from the washer itself. The same research review found that smell-causing bacteria form slimy films in the damp, hard-to-reach parts of a washer, like the rubber door seal, the detergent drawer and the filter.

    Do this insteadWipe out the door seal and the detergent drawer, and run your washer’s cleaning cycle the way its manual says. The full washer routine is on the page below.

    Full tip: How to clean a front-load washer and stop the musty smell

  7. Mixing your fixers in one load

    Why it backfires. It is tempting to throw in everything that cleans. But oxygen bleach powder’s label says not to mix it with ammonia, chlorine bleach or other household chemicals. And Washington State’s health department warns that chlorine bleach mixed with an acid like vinegar gives off chlorine gas.

    Do this insteadUse one fixer per wash, and keep vinegar out of the washer altogether. Maytag, a washer maker, says its acid can wear down rubber seals and hoses, especially in front loaders.

    Full tip: Cleaning products you should never mix

Be safe

  • Never mix chlorine bleach with vinegar, ammonia or oxygen bleach powder. Keep vinegar out of the washer. See the full never-mix chart.
  • Boil only white 100% cotton towels. Water that is too hot fades colored fabric, and nothing synthetic goes in the pot.
  • No aluminum pots. The washing soda label says not to use it on aluminum cookware. Use stainless steel or enamel.
  • Scald risk. Fill the pot no more than about two thirds, lift towels with tongs, let the water cool before you handle them, keep kids and pets out of the kitchen, and never let the pot boil dry.
  • Gloves and eyes. Washing soda and oxygen powder both warn that they irritate or injure eyes. Wear gloves, and if powder gets in your eyes, flush with water for 15 minutes and follow the label. Poison Help line, 1-800-222-1222. It is free and confidential, 24 hours a day, 7 days a week.
  • Never store mixed oxygen powder solution in a closed container. The label warns pressure can build up and burst it.

What to buy

We may earn a small fee from these links. It never changes the picks or your price.

  • Arm & Hammer Super Washing Soda, 55 oz

    For the stovetop reset. $5.43 at Walmart.com on 11/6/2026; 4.8 stars from 11,687 ratings.

  • OxiClean Versatile Stain Remover Powder, 1.77 lb

    For colored towels or a washer reset when you have no big pot. $6.12 at Walmart.com on 11/6/2026; 4.7 stars from 23,833 ratings.

  • Mainstays 12 inch stainless steel locking tongs

    To lift hot, heavy towels out of the pot safely. $1.56 at Walmart.com on 11/6/2026; 4.6 stars from 421 ratings.

More picks: Best cheap stain removers for clothes

Why it works

Think of a sour towel as a place bacteria have moved into. They settle into the towel, and they love three things: water that never gets hot enough, leftover soap that keeps the towel from drying, and a towel that stays damp for hours. Take away all three and the smell has nowhere to live.

None of these mistakes means your house is dirty. Most of them start as a good habit, like saving energy with cold water or adding a little extra soap to be sure. The habit is kind. It just works against the towel.

A word from Denise

So turn the water up, measure the soap, skip the softener and let the towels dry all the way. Then you will stop smelling your towels at all, which is exactly how a clean towel should smell.

Questions people ask

Why do my towels smell bad right after I wash them?

Usually bacteria have built up in the fabric, helped by cool washes, leftover detergent and slow drying. A hot reset clears it, and better habits keep it from coming back.

Should towels be washed in hot water?

Yes, as hot as the care label allows. Research on laundry found that washes around 122°F and up remove bacteria far better than cold, quick cycles.

How often should I wash bath towels?

Speed Queen suggests using a towel no more than three times between washes, and hanging it to dry between uses.

Can I put vinegar in with my towels?

Not in the washer. Maytag, a washer maker, says vinegar’s acid can wear down rubber seals and hoses, especially in front loaders. If you want to try it, soak the towels in a tub instead, with 1 cup of vinegar in warm water for about 30 minutes, then rinse them well. Never mix vinegar with chlorine bleach.

Why are my towels stiff and scratchy?

Stiff towels can be a sign of soap residue. Measure your detergent carefully and skip fabric softener.

More help like this

Next tipHow to get a grease stain out of a shirt
Denise laughing in her kitchen

About Denise

I’m Denise, and I explain home fixes the way a friend would at your kitchen table. Every tip I share is written from the sources listed on its page and checked against them before it goes up.

How my tips are checked

Sources

Sources opened and checked on November 7, 2026.

  1. Van Herreweghen F, Amberg C, Marques R, Callewaert C. Biological and Chemical Processes that Lead to Textile Malodour Development. Microorganisms, 2020 pmc.ncbi.nlm.nih.gov
  2. Speed Queen, Freshening Towels 101 speedqueen.com
  3. Federal Trade Commission, Care Labeling of Textile Wearing Apparel rule, Appendix A glossary ftc.gov
  4. American Cleaning Institute, Laundry Basics cleaninginstitute.org
  5. American Cleaning Institute, Laundering Problems and Solutions cleaninginstitute.org
  6. Arm & Hammer, Super Washing Soda for laundry armandhammer.com
  7. Arm & Hammer Super Washing Soda, 55 oz, label directions and warnings, Walmart.com walmart.com
  8. OxiClean Versatile Stain Remover Powder, 1.77 lb, label directions and warnings, Walmart.com walmart.com
  9. Washington State Department of Health, Bleach mixing dangers doh.wa.gov
  10. HRSA Poison Help, Calling Poison Help (1-800-222-1222; free and confidential help 24 hours a day, 7 days a week) poisonhelp.hrsa.gov
  11. Maytag, Stop using vinegar to clean your washing machine (acid can wear down rubber seals and hoses, especially front load washers) maytag.com
  12. Maytag, Should you rewash laundry left in the washer overnight? (vinegar soak in a tub, 1 cup in warm water about 30 minutes, then rinse; vinegar can damage washer parts) maytag.com
Fact log: how each claim on this page was checked (26 claims)

Every claim on this page, the source behind it and what the check found. Kept open for anyone who wants to look under the hood.

ClaimSourceWhat the check found
Frequent cold, short washes do not remove microbes, skin oil and odor compoundsSource 1 (“inefficient in removing microorganisms, sebum and odorous compounds”), opened November 6Matches the source.
50°C (122°F) and up generally removes bacteriaSource 1 (“temperatures of 50 °C and above lead to a sufficient bacterial removal”)Matches the source. 122°F is the conversion
Care label “hot” = 112 to 145°FSource 3Matches the source (official).
Soap residue builds up, slows drying, can cause musty smell; leftover suds = too muchSource 2Matches the source (washer maker, not neutral).
Measure detergent by the package; HE detergent for HE washersSource 2Matches the source.
Softener builds up on towels and reduces softnessSource 2Matches the source (maker view, framed as “skip it on towels”).
Slow drying = higher microbial load; fast and tumble drying reduce itSource 1Matches the source.
Never throw a wet towel in the hamper; hang to drySource 2Matches the source.
Don’t overload; clothes need room to moveSource 4Matches the source.
Towels mixed with sweaters and flannels cause lintSource 5Matches the source.
Biofilms in washer door seal, detergent drawer, filterSource 1Matches the source.
Washer cleaning: wipe the seal and drawer, run the cleaning cycle per the manual; full routine on the washer pageSource 1 (where biofilms form)Matches the source. Speed Queen’s 1/4 cup bleach cycle was taken out on November 7 so the site gives one washer-clean dose (on the washer page)
Oxygen powder label: do not mix with ammonia, chlorine bleach or other household chemicals; never store solution sealedSource 8Matches the source (label).
Bleach plus acid like vinegar gives off chlorine gasSource 9Matches the source (official).
Vinegar stays out of the washer (acid can wear seals and hoses, especially front loaders); optional tub soak, 1 cup in warm water about 30 minutes, then rinseSources 11 and 12Matches the source (maker; site-wide vinegar rule November 7: no vinegar in the washer).
Reset: boil white 100% cotton 15 min, 2 Tbsp washing soda per gallonSource 6 (2 Tbsp per gallon is the maker’s soak ratio)Matches the source. Note: the maker gives this ratio for warm-water soaking; the 15-minute boil is from the original video, backed only by the heat research, not tested on smell
Colored towels or no pot: hottest label-allowed wash plus oxygen bleach and detergentSource 1 (oxygen bleach offsets lower temperatures)Matches the source.
Water too hot for colored fabrics causes color lossSource 5Matches the source.
Washing soda: do not use on aluminum cookwareSource 7 (label) and Source 6Matches the source (label).
Eye warnings, flush 15 minutesSources 7 and 8 (labels)Matches the source (label).
Poison Help line, 1-800-222-1222; free and confidential, 24 hours a day, 7 days a weekSource 10Matches the source (HRSA Calling Poison Help page; one wording site-wide, November 7).
Use a towel no more than three times between washesSource 2Matches the source (maker suggestion, framed as such).
Prices and ratings: washing soda $5.43 (4.8, 11,687); OxiClean Versatile 1.77 lb $6.12 (4.7, 23,833); Mainstays tongs $1.56 (4.6, 421)Walmart.com search results, opened November 6, 2026Dated; online price, varies by store
Reset takes “about an hour with cooling time”15-minute boil plus heat-up and coolingEstimate from the steps
Stiff towels can signal soap residueSource 2 (“stiff, wet clothes suggest soap residue”, summary)Matches the source. As “can be”
Pot no more than two thirds full; tongs; let coolGeneral stovetop safety advice; no single source on this pageStated as precautions