How Often Should You Wash Towels? A Microbiologist Warns

In the bathroom, the soft fabric hangs faithfully from its rail, is used several times a day and seems completely harmless. Who gives germs a second thought? A microbiologist now warns that the washing routine followed by many households is well off the mark – and may put strain on both skin and health.

How dirty is a towel really?

After a shower, we feel clean, refreshed and pure. So the towel cannot be that dirty, can it? That is precisely the misconception. Every time you dry yourself, residues are left behind – even when they are invisible.

• dead skin cells
• skin oils and sweat
• traces of shower gel, shampoo, cream or make-up

Moisture is another factor. The fabric often remains slightly damp for hours, particularly in small bathrooms or those with poor ventilation. For micro-organisms, this creates an ideal breeding ground.

“A towel is not a sterile piece of cloth, but a warm, damp collecting place for germs – and the longer it hangs there, the more comfortable they become.”

Philip Tierno, a US microbiologist at New York University, points out that bacteria and fungi can multiply noticeably after just a few uses. They can double particularly quickly in damp rooms. Studies show that the number of germs on a wet towel can double within 20 minutes.

Everyday risks that are often overlooked

Healthy skin can tolerate a great deal. However, the more germs there are in the fabric, the greater the chance that something may go wrong. The following situations are especially sensitive:

• sensitive or cracked skin – for example after shaving, sunburn or with eczema
• acne and blemishes – contaminated towels can make spots worse
• allergies and respiratory problems – damp fabrics may also collect mould spores and bacteria
• people with weakened immune systems – including those with chronic illnesses or older people

There is another consideration: anyone who uses inhalation devices, sprays or nasal rinses transfers germs from the mouth and nose area to facial skin. If the same face towel is then used every time, all of this ends up in the fabric and returns to the skin on the next use.

How often should towels really go in the wash?

Many households wash bath towels weekly, or even only once a fortnight. Hygiene researchers consider that far too infrequent. A sensible routine should be based on use rather than the day of the week.

As a general rule, a bath towel should be washed after three to four uses. For anyone who showers every day, that means roughly every two to three days.

In some circumstances, washing even more often is worthwhile, such as when the bathroom has high humidity, there are many people in the household or young children are present. Those living in a very dry home who hang their towels correctly can extend the interval slightly – but not to several weeks.

“The question is not: ‘How often do I feel like doing laundry?’, but: ‘How often do I actually use this towel?’”

How to care for towels hygienically while still protecting them

It is not only the frequency of washing that determines how clean and durable a towel remains; the way it is cared for matters too. A few straightforward habits can make a significant difference to hygiene.

Let towels dry properly

• Spread towels out fully after showering instead of leaving them crumpled over the rail.
• If the bathroom is very damp, hang the towel in the bedroom or hallway.
• Open the bathroom window regularly or use an extractor fan so moisture can escape.

The faster the fabric dries, the poorer the conditions are for bacteria and fungi.

Washing temperature and detergent

• Wash at 60°C if the material allows it – this significantly reduces the number of germs.
• Standard biological powder detergent often works better against bacteria than liquid detergents alone.
• Do not overload the washing machine, so that water and detergent can reach every part of the load.

Heavily soiled or damp sports towels should not be left in the laundry basket for long. Otherwise, the familiar musty smell can develop and may be difficult to remove.

Fabric conditioner – yes or no?

Fabric conditioner makes towels feel soft, but it coats the fibres like a film. This can reduce absorbency and make cleaning less thorough. Many experts therefore advise the following:

• Use fabric conditioner sparingly or avoid it altogether.
• Alternatively, add a splash of white vinegar to the fabric-conditioner compartment – it can neutralise odours without coating the fibres.

How long can a towel stay in the cupboard?

Even the best wash cycle cannot turn an old, thinned towel into a hygiene champion again. Over time, fibres break down, the fabric becomes rough and absorbs water less effectively. More germs can then settle in these damaged structures.

These guidelines can help:

• Replace bath towels around every two years, depending on how often they are used.
• Frequently used hand towels and sports towels may need replacing sooner.
• Dispose of towels that are badly discoloured, full of holes or permanently smell musty.

Do not share: why everyone needs their own towel

Particularly in families with children, it can be tempting to grab whichever towel is closest “just for a moment”. From a hygiene perspective, that is not a good idea. Anyone sharing a towel is also sharing bacteria, viruses and fungal spores – even if nobody appears visibly ill.

“One towel per person significantly reduces the risk of skin infections and transmissible germs – especially during the colder months.”

A practical tip is to identify towels by colour, for example:

• give every family member their own colour
• use small labels or sewn-on patches
• fit separate named hooks in the bathroom

This prevents children from accidentally picking up the wrong towel, while visitors can also quickly be given their own piece of fabric.

Why “smells fresh” does not automatically mean “is clean”

Many people rely on their sense of smell: as long as a towel does not smell musty, it seems fine to keep using. The problem is that bacteria and fungi are already present long before an odour develops. Conversely, a towel may smell of detergent yet still not be properly low in germs if the machine was too full or the wash temperature was too low.

Hygiene experts therefore recommend not relying on instinct, but setting clear routines: a designated hook, a fixed number of uses, then straight into the wash – with no debate required.

What exactly are “germs” – and when do they become dangerous?

The word germs sounds alarming, but it initially simply refers to micro-organisms: bacteria, fungi and, in some cases, viruses. Many are harmless, and some are even beneficial. It becomes critical when:

• too many disease-causing pathogens are present in one place
• skin is damaged or irritated
• the immune system or skin flora is out of balance

A towel on its own does not make anyone ill. Yet in combination with small wounds, shaving cuts, scratched spots, stress or lack of sleep, the risk rises that the body can no longer deal with everything. In that case, even a small number of aggressive pathogens can trigger inflammation.

Washing towels regularly and correctly raises this threshold considerably. Put simply, the skin faces fewer “attacks” each day and can deal more effectively with those that cannot be avoided.