NerdClean

Why Do My Towels Smell After Washing?

Updated August 2026

The short answer

Towels that smell after washing almost always have one or more of these causes: detergent buildup in the fibers, fabric softener residue, not drying fully before storage, an overloaded washer that does not rinse adequately, a dirty washing machine transferring odor to laundry, or hard water leaving a mineral film. The cause matters because the fix is different for each. A stripping wash and routine changes handle most cases. For the step-by-step treatment to remove established sour towel odor, see the guide on fixing sour-smelling towels.

How to identify your cause

Work through these questions before doing anything:

  1. 1Do towels smell right out of the washer, or only after hanging for a while? Immediate odor usually means bacteria survived the wash. Odor that develops after hanging usually means incomplete drying; moisture left in the fibers activates bacteria.
  1. 2Do the towels feel stiff or slightly waxy when dry? Stiffness usually indicates product residue (excess detergent, fabric softener, or both) that did not fully rinse out.
  1. 3Does your washing machine smell when you open the door? If the machine has a mildew or stale odor, it is likely contributing to the towel odor. Clean the machine first before treating the towels; otherwise you are rewashing towels in a contaminated drum.
  1. 4Are you washing towels on a cold or quick cycle? Cold water and short cycles may not reduce bacteria effectively, especially on towels with established buildup.
  1. 5Are towels packed tightly in the machine? Overloading prevents adequate water circulation and rinsing; detergent stays in the fibers and bacteria are not fully removed.
  1. 6Do you use fabric softener on towels? Fabric softener coats towel fibers with residue that traps bacteria and reduces absorbency over time. It is one of the most common causes of recurring towel odor.
  1. 7Are the towels old? Over time, towel fibers compact and become less absorbent. Older towels with compressed fiber structure are harder to fully dry and more prone to persistent odor. If a towel has had recurring odor for a long time and does not respond to treatment, fiber age may be a factor.

What to do based on what you found

Machine smells → do Step 1 first, following your washer's own cleaning instructions.

Towels feel stiff or waxy → this often points to detergent or fabric-softener buildup. Start with the buildup-removal guidance in Step 2, using a method compatible with your washer.

Odor develops after hanging, not right out of the wash → incomplete drying is the likely cause. See the drying guidance in Step 3 and the prevention list below.

You use fabric softener on towels → stop, per the prevention list below, and expect the existing buildup to take more than one wash to fully clear.

Steps

Step 1: If the washing machine smells, clean it first — follow the washer's own Tub Clean, Clean Washer, or maintenance-cycle instructions, using only the cleaners and methods your manufacturer permits. See our guide to cleaning a smelly washing machine for the full process. Skipping this step means you're rewashing towels in a machine that's part of the problem.

Step 2: Address detergent and fabric-softener buildup on the towels themselves. Stop using fabric softener (see below), wash at a temperature your towels' care label allows, and make sure the washer isn't overloaded so water and detergent can rinse out fully. Use the detergent amount appropriate for your product, washer, and load rather than more — excess detergent is a common source of the buildup behind the smell. An extra rinse cycle, if your machine offers one, helps clear residue. If your washer's manufacturer permits it, an occasional vinegar rinse is one option some people use for stubborn buildup; it isn't required, and skip it if your manufacturer advises against adding vinegar to the machine.

Step 3: Dry promptly and completely, using a dryer setting your care label permits, or another method that gets the towels fully dry. Don't leave damp towels sitting in the drum or the machine after a cycle ends.

Step 4: Smell the towels before folding. If odor remains, repeat the buildup-removal step. Badly affected towels sometimes need more than one round.

Prevention going forward:

Use the detergent amount recommended for your product, washer, and load, and avoid overdosing — excess detergent can leave residue.
Stop using fabric softener on towels.
Hang towels spread open (not folded) after use to allow faster drying.
Wash every 3–5 uses.
Leave the washer door or lid open between uses to prevent mold in the drum.
An occasional baking soda rinse, used according to the product's own directions, is another option some people use for lingering odor.

What not to do

  • Do not use fabric softener on towels. It makes towel odor worse over time by coating fibers with residue that traps bacteria.
  • Do not fold or store towels while damp. They must be completely dry before folding.
  • Do not wash towels on cold or quick cycles if odor is a recurring problem. Warmer and longer cycles are more effective at reducing bacteria and rinsing out residue.
  • Do not overload the washer. Towels need room to circulate for adequate rinsing.
  • Do not ignore a smelly machine. A mildew-contaminated washer will transfer odor to everything you wash in it.

Frequently asked questions

Why do my towels smell musty even though I wash them regularly?

Washing frequently with too much detergent or fabric softener compounds the problem rather than solving it; each wash adds more residue for bacteria to feed on. Address the buildup directly: stop using fabric softener, use the detergent amount appropriate for your product and load rather than more, and make sure the washer isn't overloaded so everything rinses out fully. If your washer's manufacturer permits it, an occasional vinegar rinse is one option for stubborn buildup — check your manufacturer's guidance first. Dry the towels promptly and completely afterward.

Is it worth treating old towels or should I replace them?

First rule out the more common causes: a washer that needs cleaning, too much detergent or softener, and towels that aren't drying completely. If odor persists despite correcting those and drying towels fully, very old towels with compacted fibers can be harder to dry all the way through and more prone to lingering odor — replacement is a reasonable choice at that point, but there's no fixed number of washes that determines it.

Not sure if this approach is right for your situation? Use the Stain Rescue Tool to get a personalized step-by-step plan based on your stain, surface, and what you have at home.

Use the Stain Rescue Tool

Related guides

Why Your Towels Smell Sour (And How to Fix It)

How to Clean a Smelly Washing Machine

How Often to Wash Towels (By Towel Type)

Research sources (2)

These sources inform the stain chemistry and material-safety principles used in this guide. Some research supports the underlying mechanism rather than testing the complete household method.