Expert reveals how to remove armpit stains once and for all

As summer temperatures rise, increased perspiration can lead to one of the most persistent laundry problems: yellow underarm stains on clothing. 

But according to Noor de Swart, founder and CEO of Super Label Store, these stains can be removed permanently with the right approach. 

“Yellowing occurs when sweat proteins react with aluminium compounds commonly found in antiperspirants,” explains De Swart. “Once the combination settles into fabric, especially in light-coloured garments, it can create long-term discolouration if not treated correctly.” 

Vinegar and baking soda treatment 

The combination of white vinegar and baking soda creates a powerful cleaning solution that breaks down the proteins in sweat stains. 

Mix equal parts white vinegar and water, then soak the stained area for 30 minutes to begin breaking down the build-up. After soaking, apply a paste of baking soda and water directly to the stain. Gently scrub with a soft brush or old toothbrush and let it sit for another 30-60 minutes before rinsing or washing as usual. 

“This two-step process is especially effective on older stains that have settled into the fabric,” De Swart notes. “It’s particularly useful on white cotton shirts that have become discoloured over time.” 

Lemon juice brightening method 

Lemon juice acts as a mild natural bleach due to its citric acid content, and sunlight enhances its brightening effect. 

Squeeze fresh lemon juice directly onto the stain and rub the fabric together gently, then simply lay the garment in direct sunlight for 1-2 hours. The combination of UV rays and natural acid helps dissolve stain compounds and refresh fabric colour. 

“Lemon juice is ideal for white garments, but it’s best to avoid using this method on coloured fabrics, as it may cause fading,” she warns. 

Aspirin solution soak 

Crushed aspirin tablets can help remove perspiration stains thanks to their salicylic acid content – an effective compound for breaking down proteins. 

Crush three uncoated aspirin tablets and dissolve them in half a cup of warm water. Apply this solution directly to the stained area and let it soak for several hours. Wash the garment as usual afterwards. 

“This method works particularly well on cotton T-shirts that have built up residue from repeated wears,” De Swart explains. “It’s a simple but powerful approach.” 

Enzyme-based stain removers 

Specialized enzyme cleaners target protein-based stains specifically by breaking them down at a molecular level. Look for products containing protease enzymes for best results against sweat stains. 

De Swart recommends applying enzyme cleaners directly to stains. “Pre-treat the area for at least 30 minutes before washing. These products work especially well in summer months when sweat stains tend to be more abundant and set more quickly due to heat.” 

Hydrogen peroxide mixture 

A combination of hydrogen peroxide, baking soda and dish soap creates a multi-action cleaning paste that targets both stains and the waxy buildup often left behind by antiperspirants. 

Mix one part hydrogen peroxide with two parts baking soda and a small amount of dish soap. Apply the mixture directly to the stained area and scrub gently with a soft brush. Let it sit for one hour before washing in the hottest water safe for the fabric. 

“This method tackles both the yellow tint and any lingering residue,” says de Swart. “It’s one of the most comprehensive at-home solutions available.” 

Salt soak 

Another traditional remedy involves salt, known for its ability to draw out moisture and impurities from fabric. 

Dissolve four tablespoons of table salt in one liter of warm water. Soak the stained area in the solution for at least one hour, then gently scrub the fabric before rinsing. This method is particularly effective on fresh stains and can be repeated as needed. 

“Salt is underrated when it comes to stain removal,” says de Swart. “It’s not as aggressive as chemical options, but it can be highly effective when used promptly.” 

How to prevent yellow armpit stains 

De Swart noted that prevention remains the best approach. “Wearing an undershirt, washing clothes promptly after sweating, and applying antiperspirant correctly by allowing it to dry completely before dressing can significantly reduce stain formation,” she said. 

The clothing expert added that aluminium-free deodorants might help reduce yellowing. “Many people find switching to natural deodorants without aluminium compounds dramatically decreases yellow staining on their white clothes, though you may need to experiment with brands to find one that works for your body chemistry.” 

Regular white clothes can typically be saved with these methods, but de Swart warned that once yellowing has substantially discoloured fabric, complete restoration might not be possible. Starting treatment early yields the best results.