Quick Answer
If a towel smells normal when it is completely dry but develops a sour or musty odor when it becomes damp again, the timing is a useful troubleshooting clue—not proof of one universal cause. Start by checking whether the problem affects one towel or several, then review detergent dosing, drying, storage, and the washer if other laundry is affected too.
The safest first step is to follow the towel’s care label, use the amount of detergent recommended on the product label for your load, remove the towel promptly after washing, and dry it completely before storing it. If the washer itself smells or several loads have the same problem, inspect it using the manufacturer’s instructions rather than applying a universal cleaning recipe.
Quick Diagnosis: When does the odor appear?
Timing helps determine what to check first. It does not prove the cause by itself.
Mainly when the towel becomes wet again
One-towel versus several-towel pattern, detergent or product residue, drying, and storage. If other laundry is affected, include the washer in the check.
Immediately after washing
Wash settings, detergent dose, prompt removal, and whether the washer itself has an odor.
After drying
Whether the towel was fully dry, the drying environment, and possible residue left from washing.
After storage
Whether the towel was fully dry before folding and whether the storage area is damp or poorly ventilated.
Only after repeated use
How the towel is hung and dried between uses, how often it is washed, and whether this is a separate repeated-use pattern rather than the exact wet-again-after-cleaning problem.
Towel or washer: a simple first check
Compare the pattern before changing several things at once:
- One or a few towels: The first checks are the towel’s care label, product dosing, washing routine, complete drying, and storage.
- Several towels or other laundry: A wider wash-process or washer issue becomes more relevant. Look for a pattern across loads rather than assuming every towel has the same problem.
- The washer itself smells: Inspect the drum, door seal, dispenser, and other serviceable areas according to the washer manufacturer’s instructions. Exact cleaning products, cycles, and intervals vary by model.
This comparison is a practical clue, not a laboratory test. It helps decide where to look first without claiming that the towel or washer has been conclusively identified as the source.
Likely causes to check
Too much detergent or retained residue
Too much detergent can leave residue or buildup on towels. Manufacturer and fabric-care guidance also identifies excess detergent or residue as a possible washer-odor factor. A towel that retains product or other residue may release a more noticeable odor when it becomes wet again, but the available evidence does not establish that residue is the universal explanation for this pattern.
Review the amount used for the load, washer, water conditions, and product instructions. Adding extra detergent is not a reliable default response, and it can add another residue variable.
Fabric softener or other product buildup
Some fabric-care guidance describes coatings or buildup that can affect towel absorbency. That makes product buildup worth checking, especially if the towel feels coated or less absorbent. It does not prove that fabric softener caused the wet-again odor, and it does not mean every household must stop using it permanently.
Use the product as directed and consider the towel’s care instructions. If a product change is appropriate, change one variable at a time so you can tell whether the pattern changes.
Towels that stay damp too long
A towel that remains bunched, sits wet after a wash, or dries slowly deserves attention. Prompt removal, enough space for air to circulate, and complete drying are practical ways to reduce the chance that a damp routine contributes to recurring odor.
Storage before the towel is fully dry
A towel that is not fully dry before it is folded or stored can be more likely to develop a musty odor. Store towels only when they are fully dry, and check whether the storage area itself is humid or restricts airflow.
Washer-related odor transfer or buildup
If several towels or other laundry share the problem, or the washer smells independently, the washer is one possible source to investigate. Moisture, residue, and areas that collect lint or dirt are identified in manufacturer and public utility guidance as relevant odor factors.
Use the washer manual for the correct maintenance procedure. Do not assume that one cleaner, cycle, temperature, or schedule is safe or appropriate for every machine.
What to do: a diagnosis-first sequence
Work through these checks in order instead of applying several interventions at once.
- Record the timing. Note whether the odor appears when the towel is dry, when it becomes wet again, immediately after washing, after drying or storage, or only after repeated use.
- Check the scope. See whether one towel is affected or whether several towels and other laundry show the same pattern. Note whether the washer has its own odor.
- Read the care label. Use the label to determine safe wash and dry settings. Do not assume a hotter setting is appropriate for every towel or trim.
- Review product dosing. Use the detergent amount stated for the product and load. Do not simply add more detergent to chase the odor.
- Wash using a compatible setting. Follow the care label and product instructions rather than a fixed internet recipe.
- Remove the towels promptly. Do not leave them sitting wet in the drum after the cycle ends.
- Dry completely. Spread or hang the towel so air can reach it, and store it only when fully dry.
- Check the washer when the pattern is wider. If several loads are affected or the machine smells, follow that model’s manufacturer guidance for inspection and maintenance.
Change one routine variable at a time when possible. That makes the result easier to interpret and avoids combining unsupported treatments.
If That Didn’t Work
If you already washed the towel again and it still smells when wet, return to the diagnosis rather than immediately choosing a stronger treatment.
First, ask whether the problem is limited to that towel. Then review the detergent or product history, how completely the towel dried, where it was stored, and whether the washer smells or affects other laundry. If the evidence points to the washer, use the manufacturer’s maintenance instructions for that model.
If the towel remains the only affected item after appropriate care-label-compatible washing and complete drying, replacement may eventually be a practical choice based on its condition, age, absorbency, and continued odor. It is not an automatic requirement after one failed rewash.
Prevention
- Follow the towel care label and the laundry product’s dosing directions.
- Remove towels promptly after washing.
- Give used towels enough airflow to dry fully between uses.
- Do not fold or store towels while they are still damp.
- When several loads are affected, maintain the washer according to its manufacturer’s instructions.
- If the odor pattern changes, reassess the timing instead of repeating the same treatment automatically.
For more laundry troubleshooting, see the Laundry troubleshooting hub.
Sources
- Whirlpool — How to Wash & Dry Towels to Keep Them Soft — care labels, detergent amount, loading, drying, and storage.
- LG USA Support — Washing Machine Troubleshooting Musty Odors — damp laundry, washer residue, ventilation, and model-specific maintenance.
- Loudoun Water — Common Drinking WQ Customer Questions — WQ Towels — the bounded wet/dry/wet-again observation and possible washer-transfer context; not universal proof.