How to Remove Mildew Odour from Clothes for Good

That musty, damp smell clinging to your clothes even after a wash is one of the most frustrating laundry problems, and if you live in Ireland, you’ve probably run into it more than once. Between our famously damp weather and the amount of indoor drying most households rely on, mildew odour is a common complaint. The good news is that it’s almost always fixable, and with a few changes to your routine, preventable too.

Here’s everything you need to know about getting rid of mildew smell in clothes, from quick fixes to long-term prevention.

What Causes Mildew Odour in Clothes

Mildew smell doesn’t come from dirt. It comes from mould and mildew spores that thrive in damp, poorly ventilated conditions. A few common culprits:

Leaving wet laundry in the machine too long: Even a few hours in a closed drum after the cycle ends gives mildew the warm, moist environment it needs to take hold.
Indoor drying without airflow: Ireland’s climate means a lot of us dry clothes indoors on airers or radiators, often in rooms without much ventilation. Clothes that take too long to dry are prime territory for mildew.
Older homes with limited ventilation: Many older builds have bathrooms, utility rooms, or hallways prone to damp, and clothes drying in these spaces pick up that smell.
Overloading the washing machine: Stuffing the drum too full means clothes don’t get properly rinsed or agitated, leaving detergent residue and moisture trapped in the fabric.
Using too little detergent or washing on too cool a cycle: This can leave bacteria behind, which is often the actual source of that “mildewy” smell.
Synthetic fabrics holding onto bacteria: Polyester, nylon, and other synthetic blends trap bacteria and body oils more easily than natural fibres like cotton, making them more prone to holding onto odour even after washing.
Front-loading machines with poor seal maintenance: The rubber gasket around the door on front-loaders traps water after each cycle, creating a breeding ground for mould that then transfers back onto clean laundry.

Quick Fixes for Already-Smelly Clothes

If you’ve pulled clothes out of the machine (or the wardrobe) and caught that musty whiff, try these before reaching for more detergent:

White vinegar rinse: Add a cup of white vinegar to the wash instead of detergent, or run a rinse cycle with it. Vinegar breaks down the bacteria causing the smell without damaging most fabrics.
Baking soda wash: Add half a cup of baking soda directly to the drum along with your regular detergent. It neutralises odours rather than masking them.
Dry in direct sunlight and fresh air where possible: UV light and airflow are natural mildew killers. Even a couple of hours outside on a dry day can make a noticeable difference.
Re-wash on the hottest cycle the fabric allows: Heat kills the bacteria that cool washes can leave behind.

Deep-Clean Method for Stubborn Odour

If the smell persists after a normal wash, it’s time for a more thorough approach:

Wash the affected items on the hottest cycle suitable for the fabric.
Add one cup of white vinegar to the detergent drawer or drum.
Once that cycle finishes, run a second wash with half a cup of baking soda, skipping detergent this time.
Dry as quickly as possible, ideally outdoors or in a well-ventilated space.

If the smell still won’t budge, the issue may not be the clothes at all. It could be the machine itself.

Other Odour-Fighting Options

If vinegar and baking soda aren’t cutting it, a few other products are worth trying:

Oxygen-based bleach (sodium percarbonate): Unlike chlorine bleach, it’s safe for coloured fabrics and works by releasing oxygen bubbles that lift bacteria and residue out of the fibres. Dissolve it in hot water and soak the item for a few hours before washing.
Borax: Added to a wash cycle, borax raises the water’s pH, which makes it harder for mould and bacteria to survive. It’s particularly effective on towels and gym wear.
Enzyme-based detergents: These are designed to break down organic matter (sweat, oils, skin cells) that ordinary detergents can miss, which is often what mildew odour is actually feeding on.

Check the Washing Machine

A mouldy drum, dirty door seal, or clogged detergent drawer can reintroduce mildew smell to every load, no matter how well you wash. Run an empty hot cycle with vinegar or a washing machine cleaner every month or so, wipe down the rubber seal after each wash, and leave the detergent drawer open to dry between uses.

Preventing Mildew Smell Before It Starts

Once you’ve dealt with the current problem, a few habit changes go a long way toward stopping it coming back:

Don’t leave wet clothes sitting: Transfer laundry to the dryer or airer as soon as the cycle finishes, ideally within 30 minutes.
Aim to dry clothes within a few hours of washing: The longer damp fabric stays damp, the more chance mildew has to develop.
Use a dehumidifier if you’re drying indoors regularly: This is especially useful for homes without a dedicated utility room or tumble dryer.
Leave the washing machine door open between washes: This lets the drum air out and stops moisture building up inside.
Space clothes out when drying: Overcrowded airers slow drying time and trap damp air between garments.

When DIY Isn’t Enough

Sometimes, no amount of vinegar and baking soda fully shifts a deep-set mildew smell, particularly with delicate fabrics, heavily soiled items, or garments that have been damp for an extended period. In these cases, professional laundry care can make a real difference. Commercial-grade machines reach higher temperatures and use more thorough extraction than most home appliances, which helps eliminate odour-causing bacteria that a household wash can’t fully remove.

This is also worth considering for businesses managing linens, uniforms, or towels at scale, where consistent, hygienic results matter more than a DIY fix.

Final Thoughts

Mildew odour in clothes is common in damp climates, but it’s rarely a lost cause. A combination of the right wash technique, faster drying, and better ventilation habits will solve most cases. And for the times when a stubborn smell just won’t lift, professional laundry services are worth exploring, whether for a single treasured item or ongoing needs.