Yellow stains on garments are caused by the reaction between the salts in your sweat and anti-perspirant ingredients with aluminum compounds. You can prevent the stains by wearing an undergarment to protect the outer garment or switching to an anti-perspirant with a low amount of aluminum compounds.
Yellow stains should be removed as soon as possible. Leaving the stains on the garments can make them set in and become harder to remove. If your white shirts are showing yellow underarm stains, there are a number of ways you can remove the coloration. Here are two stain removal methods you can use:
i) The 1:1:1 method
Mix one part of water, hydrogen peroxide and baking powder into a solution and use it to treat the stain. Ideally, the ingredients should be about ¼ cup. Use a thick white towel to protect the counter top from getting stained by the solution. Rub the solution on the shirt and allow it to work for at least 30 minutes. Finally, use an old toothbrush to loosen any residue on the garment and then wash normally with warm water.
ii) The 1:1 method
Mix one part of household ammonia and an oxygen-based bleach to treat the stains. Mix about 2 tablespoons of each solution and rub it on the stain for at least 30 seconds and allow it to work for about 10 minutes. When working, wear rubber gloves and protect your countertop with a thick white towel. Also, make sure you work in a well-ventilated room.
How to Clean Sweat Stains for Dark Shirts
Yellow sweat stains may not be obvious on dark colored shirts but can result into some odor, residue or stiffness under the arms. You can remove the buildup and freshen the garment by using distilled white vinegar. Fill a bucket with cold water with a cup of distilled white vinegar and leave the shirt to soak for about 30 minutes. After this, use an old toothbrush to scrub off the residue and wash the shirt normally.
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