Why clothes can smell after slow drying

Short answer: When wet clothes stay damp for more than a day, bacteria get time to multiply. The smell comes from their waste products and only goes away with a new wash. The good news is that it is easy to avoid once you know what is happening.

Moisture plus time equals smell

Bacteria need water, warmth and time, and slow drying gives them all three at once. A garment hanging damp in a cool room all day becomes a good place for them to grow. Thick items like bamboo sweat clothes are hit first, because there is more fabric that has to give up its water.

Why the smell stays after drying

Many people think the smell will fade once the clothes are finally dry. It rarely does. What the bacteria left behind sits in the fibres and comes back when the fabric warms up against your body. That is why a sweatshirt often smells most after you have worn it for a while.

Air flow matters most

The faster the moisture leaves, the less time the bacteria get. It is less about heat and more about air that moves. Hang each item with space around it so air can reach every side. This also goes for socks for women, which tend to hang close together on the rack.

Hang it up straight away

The clock starts the moment the programme ends. Clothes left in a wet heap in the drum start to smell sooner than clothes that hang. Take the load out at once, shake each piece and hang it up. If you cannot do that, wait to start the machine until you are home.

Thick and thin items dry differently

Thin tops and underwear are dry long before a hoodie or a pair of sweatpants. Hang the thick items where the air moves most, for example near an open window. Turn them inside out halfway through, so seams and pockets get air too. That way they do not hold up the whole load.

What to do if it has happened

Once clothes have picked up a smell, airing them again will not help. Wash them again at forty degrees with half a cup of vinegar in the softener drawer. The vinegar removes the smell from most things, including a bamboo bra. Then dry them quickly with plenty of air, so the problem does not return.

Keep an eye on the machine

Sometimes it is not the clothes but the machine that smells. Moisture in the rubber seal and the detergent drawer gives the same bacteria a place to live. Leave the door ajar after each wash and wipe the seal dry with a cloth. That way the clothes do not carry the smell before they even reach the rack.

A simple routine

Take the load out straight away, shake it and hang it with air around each piece. Air out the room along the way and feel the seams before you put anything away. It takes a few extra minutes, but it saves you washing the same clothes twice.

Frequently asked questions

How long can drying take

Under a day is safe for most items. If it takes more than two days, smell often follows, especially in thick fabric and in rooms with still air.

Does drying warmer help

Yes, warmth helps, but air flow helps more. A warm room without ventilation soon gets humid, and then drying almost stops anyway.

Can the smell sit in the machine

Yes. Run an empty programme at ninety degrees once a month and leave the door ajar after each wash so the seal can dry.