How to Stop Towels From Smelling Musty

The towel comes out of the wash smelling like detergent. You use it once, hang it up, and by the next morning there's that sour, damp, slightly sharp smell — the one that survives a second wash and comes back within a day. Adding more detergent makes it worse. Fabric softener makes it much worse.

This is one of the most common laundry complaints and it has a specific cause, which means it has a specific fix. The smell isn't dirt. It's bacteria feeding on residue that's built up inside the fibers, and the reason your normal wash doesn't remove it is that the residue is what's protecting them. Browse our bath towels →

What's Actually Happening

Towels are dense loops of absorbent cotton, which makes them excellent at holding water and equally good at holding everything dissolved in it. Over months, three things accumulate in those loops: detergent that never fully rinsed out, fabric softener coating, and mineral deposits from hard water.

That buildup does two things. It makes the towel less absorbent — the reason old towels seem to push water around rather than soak it up. And it creates a layer that traps moisture against the fiber, which is exactly the environment bacteria need. The musty smell is their byproduct, and it appears when the towel gets damp because that's when they become active.

This explains the frustrating part: the towel smells fine dry and sour the moment it's wet. Nothing new is happening. The bacteria are already there, waiting for water.

The Fix: Strip the Buildup First

Step 1: Hot Wash With Vinegar, No Detergent

Run the towels alone on the hottest cycle the fabric allows, with about a cup of white vinegar in the drum and no detergent at all. The acid dissolves mineral deposits and breaks down softener coating. Adding detergent here defeats the purpose — you're removing residue, not adding more.

Step 2: Second Hot Wash With Baking Soda

Immediately after, run a second hot cycle with roughly half a cup of baking soda, again with no detergent. This neutralizes remaining odor and lifts what the vinegar loosened. Don't combine the two in one cycle — vinegar and baking soda neutralize each other, and you get a fizzy nothing instead of two separate treatments.

Step 3: Dry Completely, Immediately

This step is where most people undo the first two. A towel that sits damp in the machine for hours after a strip wash reseeds bacteria straight into clean fibers. Move them to the dryer or the line the moment the cycle ends, and dry them fully — a towel that's ninety percent dry is still a wet towel as far as bacteria are concerned.

After stripping, towels are often noticeably more absorbent. That's the coating gone, not new fabric.

Keeping It From Coming Back

Stop Using Fabric Softener on Towels

Softener works by depositing a waxy coating on fibers. On clothing that's fine; on towels it's directly counterproductive — it reduces absorbency and creates the exact layer that traps moisture. If you want softness, white vinegar in the rinse does it without the coating.

Use Less Detergent, Not More

The instinct when towels smell is to add detergent. But excess detergent is a primary cause of the problem, because dense towel fibers don't rinse clean and the surplus stays behind as food for bacteria. Use roughly half what the cap suggests for a towel load. Manufacturer dosing assumes maximum soil and a soft-water machine.

Don't Overload the Machine

Towels need room to move for water to flush through them. A drum packed with towels means the water never fully circulates, and neither detergent nor rinse water reaches the middle of the load. Half to two-thirds full is right for towels.

Hang Them So They Actually Dry

This is the single biggest daily factor. A towel folded in thirds over a bar has three layers of wet fabric pressed together, and the inner surfaces stay damp until the next use. Spread flat and full-width over a bar, or use hooks with enough spacing that the towel hangs open. See our towel bars and hooks →

Bathrooms with poor ventilation make this harder — run the fan for fifteen to twenty minutes after showering, or crack a window. A towel drying in a humid room isn't drying.

Wash Every Three to Four Uses

Not because towels get dirty that fast, but because that's roughly when the bacterial population becomes noticeable. Stretching to a week is where most musty towels come from, particularly in a shared or poorly ventilated bathroom.

What About the Washing Machine Itself?

If everything smells musty and not just the towels, the machine is the source. Front-loaders in particular develop buildup in the door gasket and detergent drawer. Wipe the gasket dry after use, leave the door ajar between loads, and run an empty hot cycle with vinegar monthly. Stripping towels in a machine that's the actual problem gets you a few clean days at most. Browse cleaning brushes →

Do Bleach or Oxygen Boosters Help?

Oxygen-based boosters help on white towels and are worth adding after a strip. Chlorine bleach kills bacteria but degrades cotton fibers with repeated use and strips color, so it's a last resort rather than a routine. Neither one addresses buildup, which is why they disappoint when used alone — they're a supplement to stripping, not a substitute.

How Long Should Towels Last?

Two to five years with normal use. If a towel has been stripped properly and still smells within a day, or has gone stiff and stopped absorbing entirely, the fibers are worn out rather than dirty. Stripping revives towels with buildup; it can't restore fiber that's been through hundreds of hot cycles.

Final Recommendation

Strip once with the vinegar-then-baking-soda sequence, then change three habits: no fabric softener on towels, half the detergent you've been using, and hang them spread out with the fan running. That combination resolves the problem for most people permanently.

If the smell returns within a week despite all of that, check the washing machine before buying new towels. A machine with gasket buildup will recontaminate every load regardless of what you do to the towels.

Explore our bath towels and towel bars and hooks for drying that actually works. For more on bathroom hardware, see our comparison of towel hooks versus towel bars.