You step out of the shower, wrap yourself in a towel, and instead of that clean, fresh feeling — a strange, musty, slightly sour smell hits you. And yet the towel was just in the washing machine. Sound familiar?
Why 104°F (40°C) is the problem
In summer, most of us try to save energy by washing everything — including towels — at 104°F (40°C). That temperature is perfectly fine for colored clothing, but when it comes to towels and the bacteria living inside them, it's actually doing more harm than good.
104°F is not hot enough to kill the microorganisms that thrive in warm, damp fabric fibers. It's just warm enough to loosen dirt and push it deeper into the material — but not enough to destroy what's causing the smell.
The structure of terry cloth makes things worse: those looped fibers trap enormous amounts of air and moisture, creating the perfect breeding ground for odor-causing bacteria.
If the wash temperature isn't high enough, those microorganisms simply survive the cycle — and your towel starts going musty before it even makes it back to the shelf.
What's really happening inside your towel
The musty smell isn't from the dirt itself — it's from what the dirt leaves behind. Sebum, dead skin cells, and moisture combine to create an ideal environment for bacterial growth. If the towel doesn't fully dry between uses, or the wash temperature isn't high enough to eliminate those bacteria, the smell just keeps getting stronger — no matter how much fabric softener you use.
Many people respond by adding more detergent or softener, which actually makes things worse. Those residues build up between the fibers, feed more bacteria, and over time make the towel less absorbent. It's a cycle worth breaking.
What temperature should you actually use
Wash towels at 140°F (60°C). That's the temperature that genuinely eliminates most odor-causing microorganisms without damaging the fabric. If your towel has a stubborn musty smell that's been building up for a while, a 140°F wash — or occasionally 195°F (90°C) — will help restore its freshness.
- White towels can be safely washed at 195°F (90°C) — the most hygienic option available.
- For colored towels, stick to 140°F (60°C) to prevent colors from fading too quickly.
- Go easy on the fabric softener — it coats the fibers and reduces absorbency over time.
- After washing, spread the towel out immediately — don't leave it bunched up in the drum or laundry basket.
Drying matters just as much as washing
Sometimes the washing temperature isn't even the main culprit — it's the drying. If your towel doesn't dry out properly between uses, it holds onto moisture for days, giving bacteria a fresh start. Hang towels somewhere with good airflow, and avoid piling damp ones on top of each other.
Fast, thorough drying does a surprising amount of work on its own. Odor-causing bacteria thrive in moisture — so a towel that's fully dry within a few hours is far less likely to smell musty between washes.
What to do if the smell has already set in
If your towel already smells musty, another 104°F cycle won't fix it. What you need is a high-temperature wash — ideally with a scoop of washing soda (baking soda's stronger cousin), which helps break down built-up residue. Some households swear by an occasional wash with detergent only — no softener, no fragrance boosters — to flush out everything that's accumulated in the fibers.
It's worth building in one deep-clean, high-temperature wash per month, even if you normally use a gentle cycle. This small habit change makes a real difference — and means fresh-smelling towels are actually waiting for you when you reach for them.
Why does my towel smell musty even after washing?
The most common reason is washing at too low a temperature — 104°F (40°C) isn't enough to kill the odor-causing bacteria living in the fibers. If the towel also doesn't dry completely between uses, the problem compounds quickly.
What's the best temperature to wash towels?
140°F (60°C) is the recommended temperature for most towels — it's hot enough to eliminate bacteria without damaging the fabric. White towels can be washed at 195°F (90°C) for maximum hygiene.
Does fabric softener make towels smell worse?
It can. Fabric softener leaves a coating on the fibers that traps bacteria and residue over time, which contributes to musty odors and reduces how well the towel absorbs water.
How often should towels be washed?
Towels should ideally be washed every three to four uses. Alongside regular washes, a high-temperature deep clean once a month helps prevent odor buildup and keeps the fibers fresh.
