You wash your towels, they smell fine out of the machine, and a week later they smell musty again. That cycle has a cause, and it is fixable. Musty towels are usually not dirty towels. They are towels carrying a buildup of detergent, fabric softener, and body oils, plus dampness that lets mildew grow in the fibres.
This guide explains the two-wash strip method that removes the buildup, and the drying rules that stop the smell coming back for good.
Quick overview
- What it is: Stripping smell-causing buildup out of towels and fixing the drying routine.
- Time needed: About 2 hours, mostly washing-machine time.
- What you need: White vinegar, baking soda, your normal detergent, and a washing machine with a hot cycle.
- Do not use: Fabric softener on towels, ever. It coats fibres, reduces absorbency, and traps the very buildup that causes the smell.
Why towels go musty
Three things combine. First, excess detergent and softener leave a waxy film on towel fibres. That film traps moisture and odour. Second, towels often stay damp too long, bunched on a rail, folded before they are fully dry, or left sitting in the washer. Third, front-loader machines with a damp door seal can pass mildew smell onto the load. The strip wash below deals with the buildup, and the drying rules deal with the dampness. You need both, or the smell returns.
Step 1: The two-wash strip method
Wash the towels on their own, with nothing else in the drum, so they get full water flow and room to move.
- Wash one: hot water plus vinegar. Put the towels in the machine, set the hottest cycle the care label allows, and add 1 cup (240 ml) of white vinegar to the drum. Use no detergent in this wash. Vinegar dissolves mineral and detergent buildup.
- Wash two: hot water plus baking soda. As soon as wash one finishes, run a second hot cycle with 1/2 cup (about 110 g) of baking soda in the drum, again with no detergent. Baking soda neutralises odour.
- Check the smell. Take a towel out and sniff it while it is still damp. It should smell like nothing, just clean cotton. If a musty note remains, repeat the pair of washes once more before drying.
- Dry fully, immediately. Tumble dry on medium-high until the towels are completely dry, or hang them spread out with good airflow. Do not leave them in the washer, and do not fold them while even slightly damp.
One warning: do not put vinegar and baking soda in the same wash. Mixed together they neutralise each other and do far less good. They work as two separate washes, in that order.
Step 2: Fix the washing routine
Stripping helps once, but the routine decides whether the smell stays away.
- Use less detergent. Most people overdose. For a normal towel load, use half to three-quarters of the dose on the box. Modern detergents are concentrated, and excess detergent is the main cause of buildup.
- Skip fabric softener and dryer sheets on towels. Both coat fibres and cut absorbency. If you want softness, the vinegar rinse below does it without coating.
- Add vinegar to the rinse occasionally. Once a month, add 1/2 cup of white vinegar to the rinse cycle of a towel load. It keeps buildup from reforming. It will not make towels smell like vinegar; the smell rinses away.
- Wash towels separately. Towels need hot water and a full cycle. Mixed loads with clothes usually get a cooler, shorter wash that does not clean towels properly.
- Do not overload the drum. Towels need room to tumble and rinse. A drum packed tight leaves detergent in the fibres.
Step 3: Fix the drying routine
Drying is where most musty towels are made, not washing.
- Spread towels out, never bunched. On a rail, drape each towel over two bars so air reaches both sides. On a heated rail, give each towel its own section.
- Do not leave towels in the washer. Move them to the dryer or line within an hour of the cycle ending. A load left overnight in a closed drum will smell musty by morning.
- Dry completely before folding. A towel that feels dry on the outside can still be damp in the middle. If you fold it damp, mildew grows in the fold. When in doubt, give it another hour.
- Let the bathroom dry too. A steamy bathroom with no airflow keeps towels damp for hours. Run the fan during and for 20 minutes after a shower, and leave the door ajar if you can.
- Wash bath towels every 3 to 4 uses. Longer than that, and body oils and skin cells build up enough to feed mildew, however well you dry them.
What about the washing machine itself?
If stripped, well-dried towels still smell musty, the machine may be the source. Wipe the door seal of a front loader dry after each wash, and leave the door and detergent drawer slightly open between loads so the drum dries. Run a hot empty cycle with 1 cup of vinegar once a month to clean the drum, and check the filter and detergent drawer for trapped residue. A clean machine makes clean towels.
When to replace a towel instead
Most musty towels recover with one strip wash. Replace a towel if it still smells after two strip attempts, if it has black mildew spots that do not wash out, or if the fabric feels thin, rough, and no longer absorbent. At that point the fibres themselves are damaged, and no wash will restore them.
Quick tips
- White vinegar is safe for white and coloured cotton towels. Skip it on silk or wool, which towels rarely are.
- Do not use bleach to fix mustiness on coloured towels. It damages fibres and fades colour.
- Keep one towel per person in rotation. Shared towels stay damp longer and wear out faster.
- If towels smell musty straight out of a clean machine, clean the machine before blaming the towels.
Strip once, use less detergent, skip the softener, and dry towels fully every time. That combination is what breaks the cycle, and it keeps towels smelling like nothing at all, which is exactly how clean towels should smell.