Skip to main navigation Skip to content Skip to footer

Getting Rid of Underarm Stains: Your Questions


My husband wears cotton white T-shirts. I use Clorox in hot water each time I launder them and rinse them twice. They are fairly new (Christmas) and they have developed stiffness in the under arms. He has asked me to buy him new ones. But that is not going to resolve the problem. What can I do? Please help.


I hear this question a lot; how do I get rid of the dreaded “pit” stains. The stiffness is simply a build-up of the underarm deodorant/antiperspirant that has not been removed wash-after-wash-after-wash. It can get almost “crunchy” and that is uncomfortable. This can be complicated by the choice of antiperspirant, with aluminum-based ones usually reported as worse for changing colors, and there also seems to be some impact of diet in producing colored components.

Think about what has happened. You take a solid underarm product and apply it to a warm body where it melts. Now, it can more easily transfer to anything that the underarm touches (T-shirt, etc.). Add to this the volume of liquid (sweat) that acts as a collection and transfer agent for anything it has collected from the armpit (deodorant, salt, bacteria, body oil, etc.) and you can better understand how this generates such a problem.

So what can we do? For the current problem, you need to do something to “re-melt” the build-up. I have seen mention of a couple of approaches: One says to use boiling water poured directly over/through the stained area (be careful of spillage). Then, follow with a paste of 1:1:1 baking soda:hydrogen peroxide:water which is applied after the hot water and rubbed (probably should wear rubber gloves here to protect your hands from the heat) aggressively into the stain. Rinse again with hot water. It may take more than one application, but this definitely should do the trick. It may also require a good pretreatment with a liquid detergent or solvent. Remember to wash in the hottest water recommended on the care label and use 3/4 cup Clorox® Regular-Bleach₂ with CLOROMAX® to help kill the odor-causing bacteria. Or the easy solution is simply cut out the affected area and he has a new set of muscle shirts.

For the future, I would check the brand of antiperspirant and see if you can find one without aluminum active. Also if new T-shirts are purchased, you might try applying the liquid detergent to the pit area when they are first removed or at least before washing to keep the build-up under control. Of course, ALWAYS wash in hot water with detergent and 3/4 cup Clorox® Regular-Bleach₂ with CLOROMAX®.