The quick answer
Clothes that smell musty, damp or sour even straight out of the wash are picking up odour from one of two places: a dirty washing machine that is transferring its own smell onto the fabric, or moisture that has been trapped in the clothes too long (in the drum, in the basket, or while drying slowly). Clean the machine and dry clothes promptly and the smell goes.
Common causes
- Mould and biofilm in the machine: a smelly drum and seal pass the odour straight onto clean clothes.
- Leaving wet washing in the drum: bacteria multiply within an hour or two, creating that sour smell.
- Slow drying: clothes dried indoors in humid air or packed on a rack stay damp long enough to go musty.
- Overloading: a packed drum doesn’t rinse properly, leaving bacteria and detergent behind.
- Washing only on cold: low temperatures don’t kill the bacteria that cause odour.
- Too much detergent or softener: residue traps moisture and bacteria in the fibres.
Step-by-step fix
- Clean the machine. Run a hot empty maintenance wash with white vinegar or a washing machine cleaner, and wipe the seal and drawer.
- Re-wash the affected clothes. Use a 60°C cycle (where the fabric allows) with a little less detergent, plus an extra rinse.
- Add white vinegar to the rinse. A cup of white vinegar in the softener compartment neutralises odour without leaving residue.
- Dry promptly and fully. Get clothes out of the drum as soon as the cycle ends and dry them quickly — outdoors or in a well-ventilated space.
- Don’t overload so clothes rinse cleanly.
How to prevent it
- Remove washing the moment the cycle finishes.
- Run a monthly hot maintenance wash to keep the machine fresh.
- Dry clothes fully before folding or putting them away.
- Use the correct detergent dose and run occasional hot washes.
- Leave the machine door open between washes.
The machine itself is the usual culprit — see why your washing machine smells bad, how to clean the door seal, and how to run a maintenance wash.
When to call a technician
If the machine is clean and you dry clothes promptly but the musty smell persists, there may be stagnant water trapped in the sump or internal hoses, or a drainage fault leaving residual water behind every cycle. An engineer can inspect and clear the internal plumbing.