To remove pit stains from darker clothing, vinegar and water may be all that is needed, in addition to a regular wash cycle. For white clothing, suggested solutions include various mixtures of oxygen bleach, ammonia, hydrogen peroxide or baking soda. Though what mixes and how much depend on the fabric and the toughness of the stain.Continue Reading
Mix together 1/4 cup baking soda along with equal amounts of water and hydrogen peroxide. This is enough to treat a single shirt. Another option would be to mix 2 tablespoons oxygen bleach (for safety reasons, do NOT use chlorine bleach) and 2 tablespoons ammonia. Place a protective cloth over the surface area, and apply the solution onto the stain. After leaving for 30 minutes, use a soft toothbrush to scrub away the residue. Allow white clothing to dry in the sun to maximize the brightness of the fabric.
Fill the washing machine with cold water, and pour in 1 cup distilled white vinegar. Allow the shirt to soak for 30 minutes. Drain the water, and wash as normal. For heavy stains, scrub with vinegar and water before placing in the washer. Darker shirts do not have stains, but they do stiffen from the aluminum residue.
Allow deodorant to dry completely before letting the skin touch the fabric. Wear an undershirt to protect more expensive clothing from being stained, and wash clothes with perspiration marks as soon as possible to minimize the chances of the stain setting in permanently. Additionally, as it's the aluminum levels in deodorant that are responsible for causing arm pit stains, using an aluminium-free deodorant or one that has a very low aluminum content can help reduce stains.