The rainy season has arrived, and for those in southern China, that means days or even weeks without sun. Laundry has to be dried indoors. But clothes dried this way often feel uncomfortable and develop a stubborn musty smell. Why?
When clothes stay damp for too long, they become a breeding ground for fungi and bacteria. Add a little "food" — like leftover skin oils and dead skin cells on the fabric — and these microbes multiply quickly, producing that unpleasant odor.
No matter how carefully you wash — even with long soaks and strong detergents — you can never completely remove all residues, including sebum and microbes.
Studies show that microbes can adhere to fabric surfaces and crevices, grow, and secrete extracellular matrices to form biofilms. Regular washing helps with hygiene, but it doesn't remove microbes that have already built these biofilms.
Even the smoothest-looking fabric, when magnified, is made of fibers woven together. The rougher and more twisted the fibers, the harder they are to clean — and the more likely they are to retain microbes and sebum.
Magnified images of different fabrics show that natural fibers like wool, silk, and cotton are harder to clean thoroughly. They also absorb more moisture than synthetic fibers, making them more likely to create a damp environment that bacteria love.
The combination of moisture, sebum and warm temperatures becomes a paradise for microbes. They feast, metabolize, and produce that indescribable stench.
Even worse, it metabolizes into several unpleasant compounds — particularly certain unsaturated fatty acids that are the main source of that musty smell. That's why the odor lingers and is so hard to get rid of.
Use a dryer. High heat effectively kills bacteria and, to some extent, fungi. It also drastically reduces drying time, which helps eliminate microbial odors.
Use a long-acting antibacterial agent when washing. While killing bacteria is important, what matters even more is keeping them from multiplying again after the wash. Regular detergents remove dirt but don't provide lasting antibacterial protection.
To tackle the smell of indoor-dried clothes, look for detergents specifically designed with long-lasting antimicrobial properties.