Why your towels smell, and how to fix it

You are probably using too much detergent

This is the most common cause and the least intuitive one. Detergent works by suspending oils and dirt so the rinse can carry them away. Put in more than the rinse can remove and the excess stays in the fabric — and towels, being thick and absorbent, hold far more of it than a shirt does.

That residue accumulates wash after wash. It stiffens the pile, reduces how much water the towel can take up, and holds moisture against the fibres, which is what produces the smell. The towel is not dirty. It is over-dosed.

The fix is to use noticeably less than the cap suggests. Those measurements assume a full, heavily soiled load in hard water, and a towel load is rarely all three. Half the marked amount is a reasonable starting point, and for a lightly used load less than that. If your machine has an extra rinse setting, use it every time for towels — it does more for this problem than any additive.

Pods make this harder to control

A pod is a fixed dose designed for an average load. It cannot be halved, which means a small load of towels gets the same amount of detergent as a full one. If you use pods and have a residue problem, either run larger towel loads so the dose is proportionate, or switch to liquid for towels specifically.

Damp is the third cause, and the one people miss

The first two put residue into the fabric. The third is simply that the towel never finished drying. A towel that feels dry on the surface can still hold water deep in the pile, and folded into a warm cupboard in that state it develops a stale smell within a day or two — which then reappears every time it gets wet.

Towels are the slowest thing in a normal wash to dry, because the pile that makes them absorbent also holds water where air does not reach. Give them longer than feels necessary. Split a large load across two dryers rather than forcing it into one.

The other habit worth breaking is leaving a finished wash sitting in the machine. An hour in a closed drum is enough for a load of towels to pick up the smell you have just spent a cycle removing, and drying afterwards does not fully remove it. If you cannot move them over promptly, it is better to run a short rinse again than to dry them from that state.

Should towels go in with anything else?

Ideally not, and there are three separate reasons. Towels shed lint heavily, especially when new, and that lint ends up on everything it is washed with — most visibly on dark clothes and on anything synthetic. Towels also want a hotter wash, a longer cycle and more agitation than most clothing, so a mixed load compromises both: either the towels are under-washed or the clothes are over-handled.

The third reason is drying. Towels take considerably longer to dry than shirts do, so a mixed load either comes out with over-dried clothing or under-dried towels, and the under-dried towels are the ones that go on to smell.

If you have to mix, keep towels with other heavy cotton — sheets, tea towels, cotton bathmats without a rubber backing. Keep them away from anything knitted, anything dark and anything with hooks or zips that will pull the pile.

How often towels actually need washing

More often than most people do, and less often than the internet suggests. A bath towel used by one person, hung spread out so it dries fully between uses, is reasonable for three or four uses. A towel that stays damp between uses needs washing after one or two, because the smell develops in the damp period rather than during use.

Hand towels in a busy kitchen or bathroom get used far more heavily and need washing every couple of days. Gym towels and anything used on skin after exercise should go straight into the wash rather than back on a hook, and ideally not into a closed laundry basket while still damp — that is where a load starts smelling before it has even been washed.

The single variable that matters most is not how many times a towel has been used but whether it dried properly in between. A towel that dries fully stays fresh far longer than the same towel used the same number of times on a crowded rail.

Drying towels properly

Drying deserves its own attention because it is where most of the damage is done and where most of the smell originates. Towels are the slowest common item to dry, and the temptation is always to call it done a few minutes early.

• Do not overfill the dryer. Half to two thirds full lets the load tumble. A packed drum rotates as a single mass and the towels in the middle never see hot air.
• Medium heat rather than high. High heat dries the outside of the pile fast and leaves the base of the loops damp, which is exactly the state that produces the smell. It also breaks down cotton fibres faster, which is what makes towels thin.
• Shake them out before they go in. Towels come out of a spin cycle compressed into a solid mass. Separating them first cuts real time off the dry.
• Check the thickest part, not the corners. Fold a towel in half and feel the middle of the fold. Cool means damp.
• Fold them once they are cool, not straight out of the drum. Warm towels folded immediately trap residual moisture between the layers.
• Line-drying works well and leaves towels stiff in hard water — that stiffness is mineral deposit, not dirt. A short tumble afterwards softens them without a softener.

Hard water makes all of this worse

Chicago water is moderately hard, and it affects this more than most people realise. Minerals in hard water bind with detergent and reduce how much of it actually does any work, so the instinctive response is to add more — which then cannot rinse out, and the residue problem compounds.

Hard water also deposits mineral scale directly into the fibres, which is what makes towels feel crunchy after line-drying and stiff even after a proper wash. Detergent alone does not remove that.

If your washes routinely leave things feeling stiff or smelling faintly stale despite reasonable dosing, a water softener additive is the answer rather than extra detergent. A cup of white vinegar in the rinse does a partial job for free and is worth trying first, though not in the same cycle as detergent.

The reset wash

Towels that already smell can usually be recovered, and it is worth trying before replacing them. The method strips accumulated residue rather than adding anything to mask it.

1. Wash the towels alone, on the hottest cycle the care label permits, with no detergent and no softener. Add about a cup of white vinegar directly to the drum.
2. Run a second cycle immediately, again with no detergent, this time with about half a cup of baking soda. Do not put both in one cycle — they neutralise each other and you get neither effect.
3. Dry them completely. Fully, not nearly. This step matters as much as the two washes.
4. Then go back to less detergent, or the residue rebuilds and you will be doing this again in three months.

Variants worth knowing

An oxygen-based laundry booster instead of the baking soda step is more effective on towels that have gone dingy as well as smelly, and it is gentler on colours than the alternatives. Give it a long soak in hot water rather than a normal cycle.

Chlorine bleach is a poor choice here. It does little about residue, which is the actual problem, and it weakens cotton fibres with repeated use — so a towel that gets bleached regularly wears out faster while still smelling.

Most towels come out of a reset noticeably better. Some need two passes. If a towel is no better after two, it is probably at the end.

Stopping it coming back

The last one on that list is worth stressing because it is free and nobody does it. A towel hung spread out on a rail dries between uses; a towel bunched on a hook does not, and by the third day it is damp all the way through.

Buying towels that last

Since this is where the question usually ends up, briefly. Weight is the most useful indicator — towels are sold by grams per square metre, and something in the middle of the range dries you well without taking forever to dry itself. Very heavy towels feel luxurious and are slow to dry, which on a damp bathroom rail is a real disadvantage.

Long-staple cotton wears better than short-staple because the fibres are less prone to shedding, which is what thins a towel over time. Beyond that, how you wash them matters more than what you paid. A mid-priced towel dosed and dried correctly outlasts an expensive one washed with too much detergent and softened every time.