Have you ever pulled a towel from the laundry, thought it smelled clean, and then noticed a musty odor as soon as you dried off after a shower? It can feel as if the smell appeared out of nowhere. Is it simply leftover water, or did the wash fail?
Often, the odor is not just water. Microbes and odor compounds can remain in fabric, and moisture can make the smell more noticeable. Skin oils, body residue, and detergent buildup may linger in the fibers. A used towel left bunched up, or clean laundry left sitting in a warm washer, spends longer in a damp environment. Research has also found odor-related microbes on washed towels after indoor drying. A review of laundry hygiene and odor control discusses how washing and drying conditions affect fabrics.
Why does the smell return when the towel gets wet?
When fabric is dry, some odors may be faint. Once the towel absorbs water again, lingering odor molecules can become easier to notice. That is why a towel may seem fine on the rack but smell sour after a shower. The towel has not necessarily become newly dirty; moisture can reveal odor that was already there.
Leaving a wet towel folded in a hamper can add to the problem. The same is true when laundry remains in a warm, damp washer after a cycle ends. Overloading a washer can make it harder for water and detergent to move through the fabric. Using far more detergent or softener than the label recommends can also leave residue. Adding extra soap every time a towel smells is not a reliable fix.
The simplest way to keep towels fresh
Start by shortening the time a towel stays damp. After use, spread it out so air can reach both sides instead of hanging it in a thick fold. Remove laundry promptly when the cycle ends, and dry it completely using a method allowed by the care label. Avoid overloading the washer and measure detergent according to its instructions. If the odor keeps returning, check the washer gasket, detergent drawer, and drum cleaning guidance too.
If a towel already smells when it comes out of the washer, the cause may be in the wash or the machine. If it smells only after drying, check whether the thick sections actually dried all the way. Loma Linda University’s hygiene guidance also recommends spreading towels out so they can dry fully. If a persistent mold-like smell remains or the towel irritates your skin, rewash it and dry it thoroughly rather than covering the odor with fragrance.
So a musty towel is not always a sign that the wash was pointless. The damp time after use, the time laundry sits in the washer, and incomplete drying all matter. A towel can smell stronger when it gets wet again because moisture makes lingering odors easier to detect.
A towel can feel dry on the outside while a folded section or thick edge is still damp. If the room has little airflow, briefly opening a window or running the exhaust fan may help; leave space between towels so air can reach them. If the odor keeps returning, check the care label and follow its washing and drying instructions.
The takeaway: A damp towel can smell sour when moisture brings lingering odor compounds and microbes in the fabric back to notice. Spread it out after use, remove laundry from the washer promptly, and dry it completely.