How to Remove Odour from Clothes That Won't Wash Out

Persistent clothing odour is one of the most common laundry complaints we hear, and one of the most misunderstood. Most people assume the problem is that their detergent isn't strong enough, so they use more of it. The actual issue is almost always bacteria and body oil that have built up in the fabric — and more detergent doesn't solve that if the wash conditions don't allow it to reach the problem.

At our Maple Ridge facility, heavily odour-affected garments get a specific pretreatment protocol before going through the wash. Here's the same approach for home use.

Why Odour Comes Back After Washing

Odour-causing bacteria feed on sweat and body oil trapped in fabric fibres. When a garment comes out of a standard wash cycle smelling fine, it's often because the water masked the smell temporarily. But if enough bacteria and oil remain in the fibre structure, the smell returns as soon as warmth — from wearing the garment or from body heat — reactivates the bacteria.

This is particularly common with synthetic athletic fabrics. Polyester and nylon-blend fibres hold onto oil more stubbornly than cotton, and their tightly woven surfaces create pockets where bacteria can survive a normal cold wash cycle.

Start With Enzyme Pretreatment

The most effective intervention is applying an enzyme-based stain and odour spray to the problem areas before washing — underarms, collar backs, and anywhere else that traps sweat and body oil. Enzymes chemically break down the protein compounds in sweat and the lipid compounds in body oil, which is what makes them significantly more effective than detergent alone for this application.

Let the pretreat sit for at least an hour. For severe or repeated odour on synthetic fabrics, leaving it for several hours before washing gives the enzymes more time to work through the oil deposits.

Wash Conditions That Actually Remove Odour

Use the warmest water temperature the care label allows. Warmer water improves bacterial kill rate and increases detergent effectiveness. For heavily odour-affected items, a warm or hot wash after enzyme pretreatment is dramatically more effective than cold water alone.

Add a laundry booster alongside your regular detergent: washing soda is the most useful option, as it softens water and improves overall cleaning effectiveness. Baking soda helps with odour absorption. Sodium percarbonate adds a mild oxidising action that helps with odour molecules. These aren't replacements for detergent — they're supplements that address the specific chemistry of odour-causing compounds.

What Makes the Problem Worse

Fabric softener is the biggest saboteur of odour treatment. It coats fibres with a chemical layer that feels pleasant but creates a barrier that traps oil and bacteria. If your workout clothes or towels have a persistent smell issue, softener is frequently the underlying cause. Stop using it on odour-prone items and run a hot wash without any softener to clear the existing build-up.

Letting sweaty clothes sit in the hamper for days before washing also compounds the problem. The longer bacteria have to establish themselves in the fibre, the more thoroughly you need to treat the garment to clear them.

When One Wash Isn't Enough

Repeated odour rebloom usually means the bacteria and oil are deeply established in the fabric. In that case, a single wash isn't sufficient — you need a deliberate strip wash to clear the build-up before going back to normal washing. For a strip wash, fill a tub with hot water, add washing soda and borax, submerge the garment, and let it soak for several hours. The goal is to draw the accumulated residue out of the fibre before washing.

For dry-clean-only garments with persistent odour, or for delicate fabrics where hot washing would cause damage, professional treatment is the right call.

The Laundry Brothers offers wash & fold and dry cleaning pickup across Greater Vancouver, seven days a week. See service areas →