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Why Do Towels Smell After Washing?

Updated May 16, 20262 min readTime needed: One extra wash cycle
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Short answer: A musty towel smell almost always means bacteria are growing on residue the wash cycle left behind — usually a buildup of detergent and fabric softener film, or towels sitting damp too long before or after washing.

Common Symptoms

  • A sour or musty smell that appears even right after washing
  • Smell intensifies once the towel gets damp again during use
  • Towels feel less absorbent than they used to
  • The washing machine itself has a similar musty smell

Likely Causes

1. Detergent and fabric softener buildup

Fabric softener in particular coats fibers with a residue that traps bacteria and reduces absorbency over time.

2. Washing on too-cool a cycle

Cool washes don't fully kill odor-causing bacteria the way a hot wash does, especially for heavily used towels.

3. Leaving damp towels sitting too long

Towels left balled up in a hamper or in the washer after the cycle ends give bacteria time to multiply before they dry.

4. A musty washing machine

If the machine's own drum, gasket, or detergent drawer has residue buildup, it can transfer the smell to every load, not just towels.

Safe Checks You Can Do

  • Check your detergent dose against the manufacturer's guidance — using more than needed leaves more residue, not cleaner laundry.
  • Check whether you're using liquid fabric softener regularly, since it's a common contributor to towel odor and reduced absorbency.
  • Smell the inside of the washing machine drum and rubber gasket for a similar musty odor.

Step-by-Step Solution

  1. 1

    Strip-wash the towels

    Run a hot wash with no detergent, using 1 cup of white vinegar in the detergent compartment. This cuts through built-up residue without adding more.

  2. 2

    Follow with a normal hot wash

    Run the towels through a second cycle with a normal amount of detergent (no fabric softener) on the hottest setting the fabric allows.

  3. 3

    Dry promptly and fully

    Move towels to the dryer or line as soon as the cycle ends, and make sure they dry completely — lingering dampness invites the smell right back.

  4. 4

    Clean the washing machine itself

    Run an empty hot cycle with a washing-machine cleaner or a cup of white vinegar to clear any residue in the drum and gasket that could be reintroducing the smell.

What Not to Do

  • Don't add more detergent thinking it will clean better — excess detergent is one of the leading causes of the smell in the first place.
  • Don't leave a finished wash load sitting in the machine for hours before drying.
  • Don't use fabric softener on everyday towels if odor keeps returning — it coats fibers and worsens the underlying buildup.

When to Call a Professional

  • The smell persists after a strip-wash and a full washing machine cleaning cycle.
  • You suspect the washing machine's drain system has standing water contributing to the smell — see our washing machine drainage guide.
  • Musty smell is present throughout the house near the laundry area, which may point to a broader ventilation or moisture issue.

Safety warning

White vinegar is safe to use in washing machines but should not be combined with bleach in the same cycle, as this can produce harmful fumes.

Frequently Asked Questions

How often should I strip-wash my towels?

Every 1–2 months for regular households keeps residue from building back up, more often in humid climates or hard-water areas.

Does fabric softener really cause towel odor?

Yes — it coats fibers with a waxy residue that traps moisture and bacteria, which is also why it reduces towel absorbency over time.

Should I wash towels separately from clothes?

It's a good habit — towels are heavier, need hotter water and longer cycles than most clothing, and washing them together can undertreat both.

Home Solutions Editorial Team

Reviewed against manufacturer documentation. Updated May 16, 2026. How we write guides

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