I’m glad you’re curious about towel washing habits! It’s possible that you may need to adjust your towel washing routine, either washing them more frequently or perhaps even less often. With the summer heat leading to more frequent showers for cooling off, it’s important to explore what science suggests about towel hygiene. This knowledge might inspire you to make some changes to your current practices.
Some people prefer to wash their towels daily, while others choose to extend the usage for up to a week. Striking a balance between these extremes is generally considered more reasonable. However, scientists offer a more informed perspective on the ideal frequency for towel washing, which can help you make a more informed decision.

We are surrounded by bacteria
It’s important to keep in mind a simple fact: we live in close proximity to bacteria. Microorganisms are present on our skin, in our surroundings, and everywhere else. They coexist with us without causing significant issues. Bacteria generally don’t bother us, and we don’t bother them either, so to speak. However, it’s essential to be aware that bacteria can be unpredictable, and we can easily transfer them from our skin to towels. The question is, what happens when these bacteria thrive independently?
This is precisely what science wants us to remember and be conscious of. When we dry ourselves with a towel, we unknowingly transfer bacteria from our skin onto the fabric. What occurs next can be quite fascinating for the bacteria. In the dark and moist environment of a bathroom towel, they find the ideal conditions to multiply and thrive. However, this is not something we desire or welcome.

You have to put the washing machine
We certainly don’t want those bacteria to thrive, reproduce, and persist in their activities. Consider this: the next time you use that towel to dry yourself, you’ll be reintroducing the bacteria onto your skin. Since they originated from your own body, it may not seem like a problem. However, there can be risks if you have an open wound, excessively dry skin, or if you are ill. But generally speaking, reusing the towel does not pose a significant level of risk in terms of bacterial presence (although it may be unpleasant to repeatedly rub bacteria on your body).
The main issue with leaving towels to dry overnight is the likelihood of doing so in the bathroom. Most likely, you hang them behind the door or on a towel rack, which means they are in close proximity to the toilet bowl. Can you imagine the implications? Other bacteria present in the bathroom environment can come into contact with the towel, complicating the situation further.

According to Charles Gerba, a microbiologist from the University of Arizona, there are numerous harmful bacteria that can be found in bathrooms, including Escherichia coli and even salmonella. In his research, he found that 90% of towels left in bathrooms were contaminated with Escherichia coli, along with other bacteria in smaller proportions.
Gerba’s advice applies not only to shower towels but also to the towels we all share at home for drying our hands after using the bathroom. He points out that it is common for people to quickly rinse their hands without thorough washing and then dry them on the towel. Unbeknownst to you, by not washing your hands diligently, you leave bacteria on the towel. Over time, these bacteria continue to multiply, and at some point, you may end up using the same towel to dry your face. According to Gerba, this practice is worse than sticking your head in the toilet.
How often do we wash them?
There is no definitive scientific consensus on the exact number of times towels should be washed. However, we can consider various studies and recommendations to arrive at an average guideline. For instance, the American Cleaning Institute suggests washing towels every three or four uses. It’s important to note that this refers to “uses” rather than specific days, so if you shower in the morning and at night during summer, it’s something to take into account.
Charles Gerba’s research suggests that it is best to wash towels after every other use, and even after each use if there are young children in the household. He also emphasizes the importance of thorough washing rather than just rinsing with water.

Another study takes a more relaxed approach, recommending washing towels once a week as sufficient to avoid any issues. However, all experts, whether advocating for more frequent washing or a more flexible schedule, highlight some essential factors to consider. These include being cautious with open wounds and avoiding sharing towels, as it may increase the risk of exposure to infections.
Additionally, while towels may not always be washed immediately after each use, it is crucial to ensure they are properly dried to prevent the growth of bacteria. It is advisable to allow them to dry in a well-ventilated area, such as a balcony, and even better if they can be naturally dried by the sun.