Grandma Knows: How to Remove Smell from Towels

There is a particular kind of frustration that comes from stepping out of a clean shower, reaching for a fresh towel, and catching a sour, musty smell the moment it touches your face. The towel looks clean. It came straight from the wash. And yet something is clearly wrong.

This is one of the most common laundry problems in everyday home life, and it tends to get worse over time if nothing is done about it. The smell can range from a faint staleness to something closer to mildew — the kind of odor that clings to fabric and does not go away after a normal wash cycle.

Understanding why this happens is the first step toward solving it properly. Once you know what is actually causing the smell, the fix becomes much more straightforward.

Why Towels Develop a Sour or Musty Smell

The short answer is bacteria. But the fuller picture is a little more interesting than that.

Towels are designed to absorb moisture — that is exactly what they are made for. But that same quality makes them a welcoming environment for microbial growth. Every time a towel is used, it picks up dead skin cells, body oils, and trace amounts of soap residue. When the towel is then folded or hung in a bathroom with limited airflow, it stays damp for a long time. Bacteria that feed on organic matter multiply quickly in that kind of environment.

The sour smell is a byproduct of that bacterial activity. It is not dirt in the traditional sense. It is the result of microbial waste embedded in the fibers of the fabric.

There is a second cause that is just as common: detergent and fabric softener buildup. Over many wash cycles, residue from laundry products accumulates inside the fibers of the towel. This residue reduces the towel's ability to dry properly and also traps the bacteria and organic matter that cause the odor. Even if you wash the towel regularly, if residue is coating the fibers, the smell never fully clears.

This is why towels that are washed frequently can still smell bad. The problem is not a lack of washing — it is that standard washing at low temperatures with too much detergent is actually making the buildup worse over time.

The Role of Heat and Airflow in Everyday Routines

Before getting into specific cleaning methods, it helps to think about the conditions that allow the smell to develop in the first place.

A towel left in a heap on the bathroom floor after use is going to smell faster than one hung flat on a rail with space on both sides. A bathroom with no window and poor ventilation will keep towels damp for hours longer than one with good airflow. A towel washed at 86°F (30°C) in a quick cycle is not being exposed to enough heat to kill the bacteria living in the fibers.

These are not dramatic failures in household management. They are ordinary situations in most homes. But recognizing them makes it easier to understand why the smell keeps coming back even after washing.

When you can, hang towels in a way that allows air to reach both sides of the fabric. If your bathroom is humid, open a window after showering or run an exhaust fan for at least fifteen minutes. These small habits slow down the cycle of bacterial growth between washes.

White Vinegar: The Most Reliable Starting Point

White distilled vinegar is one of the most effective tools for removing odor from towels, and it works for a specific chemical reason.

The acetic acid in vinegar breaks down the alkaline residue left by laundry detergents and fabric softeners. It also changes the pH environment in the fabric in a way that disrupts bacterial growth. When you wash towels with vinegar, you are not just masking the smell — you are dissolving the buildup that has been trapping odor-causing bacteria in the fibers.

This is why vinegar works when a second round of detergent does not. Adding more detergent to a towel that already has detergent buildup just compounds the problem. Vinegar cuts through that residue instead.

How to Use Vinegar on Smelly Towels

• Place the towels in your washing machine without any detergent or softener.
• Add one cup of white distilled vinegar directly to the drum or to the detergent compartment.
• Set the machine to the hottest water temperature the towels can safely handle — check the care label, but most cotton towels can be washed at 140°F (60°C).
• Run a full wash cycle.
• Do not add anything else to this cycle. The goal is to let the vinegar work without interference.

After the cycle finishes, smell the towels before putting them in the dryer. In most cases, the sour odor will already be gone or significantly reduced. If a faint smell remains, move to the baking soda step rather than repeating the vinegar wash.

One practical note: do not worry about your towels smelling like vinegar after this wash. The acetic acid smell dissipates completely once the towels dry. You will not notice it.

Baking Soda: Working Alongside Vinegar

Baking soda approaches the odor problem from a different direction. Where vinegar is acidic and dissolves alkaline residue, baking soda is mildly alkaline and works as a natural deodorizer. It absorbs and neutralizes odor molecules rather than breaking down residue.

Used together in a two-step process, vinegar and baking soda address the problem more completely than either one alone.

How to Use Baking Soda on Towels

• After the vinegar wash described above, run a second wash cycle immediately, while the towels are still damp.
• This time, add half a cup of baking soda to the drum. No detergent, no softener.
• Use warm water for this cycle — the same high heat is not necessary here.
• Run a full cycle and then transfer the towels to the dryer promptly when it finishes.

The key is not letting the towels sit in the drum between cycles. A wet towel sitting in a sealed machine is back in the same damp, low-airflow environment where bacteria thrive. Move quickly between steps.

This two-step process — vinegar wash followed by baking soda wash — is the most effective method for towels that have developed a persistent smell over time. It works by first stripping the buildup, then deodorizing the now-clean fibers.

The Importance of Drying Thoroughly

Getting towels fully dry after washing is just as important as how you wash them. A towel that is transferred to the dryer and then left there until it is only slightly damp will start developing odor again within a day or two.

If you use a clothes dryer, run it on a medium-to-high heat setting and allow enough time for the towels to dry completely — not just surface dry, but dry all the way through the thick parts of the fabric. Terry cloth towels are thick by design, and the loops that make them absorbent also trap moisture deep inside the fibers. Pull the towels out and feel the heaviest sections. If they still feel cool or dense, add more drying time.

A practical trick that speeds up drying in a tumble dryer: add a dry, clean towel to the load. It helps absorb moisture from the damp towels and reduces overall drying time.

If you line dry outdoors, direct sunlight is genuinely useful here. UV light from the sun has a natural antibacterial effect on fabric, and the combination of heat and airflow outdoors dries towels more thoroughly than indoor drying. Towels dried in full sun tend to stay fresher for longer between washes.

If you line dry indoors, make sure the room has good ventilation. Towels hung to dry in a closed room with poor airflow can take twelve hours or more to dry, and that slow drying period gives bacteria time to multiply before the towel even gets used again.

When Odor Persists After Washing

Sometimes a towel that has been smelling for a long time does not fully recover after one vinegar-and-baking-soda treatment. This usually means the residue buildup is heavy and the bacteria population in the fibers is well established.

In this case, the best approach is to repeat the two-step vinegar and baking soda process a second time before drawing any conclusions. Some towels need two full treatments to return to a genuinely fresh state.

If the smell persists after two treatments, consider the water temperature being used. Bacteria embedded in towel fibers are not reliably killed at low wash temperatures. A wash at 86°F or 104°F (30–40°C) will clean surface dirt but will not eliminate a deep bacterial problem. Cotton towels can generally handle 140°F (60°C) without damage, and that level of heat makes a significant difference in killing odor-causing bacteria.

There is also a less common but real possibility: the smell is coming from the washing machine itself, not from the towels. Washing machines — particularly front-loading models — develop mold and bacterial growth around the door seal, in the detergent drawer, and inside the drum. If this is the case, washing towels in a smelly machine will never produce fresh results, no matter how good your method is.

Run an empty hot wash cycle with two cups of white vinegar and no detergent to clean the machine. Wipe down the door seal with a cloth dampened with diluted vinegar. Leave the machine door open between uses to allow the drum to dry out. This is worth doing regularly as part of routine home maintenance, especially in households that wash frequently or use a lot of fabric softener.

Fabric Softener: A Common Contributor to the Problem

Fabric softener is worth addressing specifically because it is often assumed to be helpful for towels when it can actually make the odor problem worse.

Fabric softener works by coating fabric fibers with a thin layer of conditioning agents — usually silicone-based compounds. This coating is what makes towels feel soft and fluffy. But over repeated washes, this coating accumulates and reduces the towel's ability to absorb water properly. It also creates a layer of residue that traps bacteria and organic matter in the fibers, contributing directly to the sour smell.

Households that use fabric softener on every wash often find that their towels become progressively less absorbent and more prone to odor over time, and the connection between the softener and the problem is not always obvious.

Removing fabric softener from your towel washing routine — or at minimum, using it only occasionally — will make a noticeable difference in how long towels stay fresh between washes. The vinegar wash described earlier also helps dissolve existing softener buildup, which is part of why it is so effective for this particular problem.

How Often to Wash Towels

Most household towels are used more frequently than they are washed, and they are often stored in conditions that encourage bacterial growth between uses.

A good general rule is to wash bath towels after every three to four uses, assuming the towel is hung properly and allowed to dry fully between uses. If towels are left in a heap, or if the bathroom is particularly humid, washing more frequently makes sense.

Hand towels and kitchen towels should be washed more often — hand towels especially, since they are used repeatedly throughout the day by multiple people and rarely given time to dry fully between uses. A hand towel that is damp at the start of the day and still damp at the end of it is a very efficient environment for bacterial growth.

The goal is not perfection but regularity. A consistent routine of washing, drying thoroughly, and storing towels in a way that allows airflow will prevent the deep, persistent odor from developing in the first place. When it does develop — and in most homes, it will occasionally — the vinegar and baking soda approach described here will reliably bring towels back to a fresh, clean state.