Why Towels Smell & How to Fix It

That musty, sour smell from towels isn't mysterious. It's bacteria and mildew thriving in moisture. The good news: it's entirely preventable and fixable.

Why Towels Develop Odour

The Root Cause: Bacteria

Towels provide ideal conditions for bacterial growth: moisture, warmth, and organic matter (dead skin cells, body oils). Bacteria populations can double every 20 minutes in optimal conditions.

When bacteria break down organic matter, they produce waste compounds - volatile organic chemicals that smell unpleasant. That "dirty towel" smell is literally bacterial waste.

Most towel bacteria are harmless skin flora transferred during normal use. The smell is unpleasant but typically not dangerous for healthy people.

Mildew and Mould

If towels stay damp long enough, fungal growth joins the bacterial party. Mildew produces its own distinct musty smell and can cause visible discolouration - grey, pink, or black spots.

Mould and mildew require longer periods of dampness than bacteria. If your towels smell but look fine, bacteria is the likely culprit.

Common Causes of Towel Smell

Not Drying Completely Between Uses

This is the primary cause. A towel left bunched up, hung overlapping another towel, or in a poorly ventilated bathroom never fully dries. Bacteria flourish in the persistent dampness.

The test: Touch your towel 6-8 hours after use. If any part feels cool or damp, it's not drying properly.

Washing at Low Temperature

Washing at 30°C saves energy but doesn't kill bacteria effectively. Bacteria survive and continue producing odour even in "clean" towels.

Towels need hotter washes than delicate clothing. 40°C is minimum; 60°C is better for white towels.

Fabric Softener Buildup

Fabric softener coats fibres with a waxy residue. Over time, this builds up, trapping bacteria and organic matter within the coating. The towels become a sealed environment for bacterial growth.

Ironically, using fabric softener to make towels smell nice contributes to them smelling bad.

Overloaded Washing Machine

Stuffing too many towels in the machine means they can't move freely. Water and detergent don't circulate properly. Some towels emerge still dirty - or at least, not fully rinsed.

Towels need space. Load the drum no more than 75% full.

Not Drying Promptly After Washing

Leaving washed towels sitting damp in the machine - even for a few hours - lets bacteria recolonise immediately. All your washing effort is undone.

Storing Damp

Putting away towels before they're completely dry creates a warm, dark, moist environment. Mildew and bacteria thrive.

Hard Water Mineral Buildup

In hard water areas, calcium and magnesium deposits accumulate in towel fibres. These minerals don't smell themselves, but they create texture where bacteria can harbour and make towels harder to clean effectively.

How to Fix Smelly Towels

The Nuclear Option: Laundry Stripping

For towels with persistent smell despite normal washing, laundry stripping removes accumulated residue.

Method:

1. Fill a bathtub or large container with very hot water
2. Add 1/4 cup borax, 1/4 cup washing soda, 1/2 cup laundry detergent
3. Submerge towels completely
4. Soak 4-6 hours, stirring occasionally
5. Watch the water turn disgusting (this is residue leaving)
6. Wring out and wash normally in the machine
7. Dry thoroughly

The water will turn grey, brown, or murky - that's years of accumulated buildup. Stripping isn't for regular use, but it resets towels to clean.

Hot Wash with Vinegar

For moderate smell:

1. Wash towels on the hottest setting your machine and towels allow
2. Add 1 cup white vinegar to the detergent dispenser (or the drum)
3. Use no detergent this cycle - just vinegar
4. Run full cycle
5. Optional: run a second cycle with detergent, no vinegar
6. Dry immediately and thoroughly

Vinegar breaks down residue and kills bacteria. The smell dissipates as towels dry.

Baking Soda Wash

Alternative to vinegar:

1. Hot wash with 1/2 cup baking soda instead of detergent
2. Follow with normal detergent wash
3. Dry thoroughly

Some people alternate: vinegar wash one time, baking soda the next. Don't use them together in the same wash - they neutralise each other.

Oxygen Bleach Treatment

For white towels with stubborn smell:

1. Add oxygen bleach (sodium percarbonate) to hot wash
2. Follow package instructions for quantity
3. Run full cycle
4. Dry thoroughly

Oxygen bleach is colour-safe despite the name, but test on a hidden area first with coloured towels.

How to Prevent Towel Smell

Prevention is easier than cure.

Ensure Complete Drying

After every use:

• Hang towels spread flat, not bunched
• Don't overlap multiple towels on one bar
• Ensure good airflow in the bathroom
• Consider a heated towel rail
• In humid climates, run a dehumidifier or fan

After washing:

• Dry immediately - never leave in the machine
• Tumble dry fully, or line dry in sun/breeze
• If line drying, shake towels and hang spread flat
• Don't fold and store until completely dry

Stop Using Fabric Softener

Just stop. Fabric softener damages towel performance (reduces absorbency) and contributes to odour. If you want soft towels, use white vinegar in the rinse cycle or wool dryer balls.

Wash Hot Enough

Towels should be washed at 40-60°C. Reserve 30°C for delicates, not towels.

White towels can handle 60°C regularly. Coloured towels at 40-50°C to protect colour, with occasional 60°C washes.

Don't Overload

Give towels room to move in the drum. Half-full loads wash better than stuffed loads.

Wash Regularly

Don't let bacteria populations grow too large between washes. Bath towels every 3-4 uses; hand towels every 1-2 days.

Use Enough Detergent (But Not Too Much)

Too little detergent leaves towels dirty. Too much leaves residue. Follow package guidelines and adjust for water hardness and load size.

Ventilate Your Bathroom

Good bathroom ventilation helps towels dry between uses. Run the extractor fan, open windows when possible, and keep the door open when not in use.

When Smell Won't Go Away

If you've stripped towels, washed hot with vinegar, and ensured complete drying - and they still smell - the towels may be beyond saving.

Bacteria can colonise deep within worn fibres where washing can't reach. Very old towels or those with visible mildew damage may need replacing.

Signs it's time for new towels:

• Persistent smell despite treatment
• Visible mould or mildew spots
• Towels no longer absorb well
• Fabric is thinning or worn
• Musty smell returns within one or two uses

Sometimes the most effective solution is starting fresh with new towels and better habits.

Summary

The formula is simple: wash properly, dry completely, no fabric softener. Follow these rules and your towels won't smell.