Mix equal parts water and distilled white vinegar in a bowl. Dampen a microfiber cloth in the solution and gently dab the stained area. Let the mixture sit on the stain.

Tackle the pesky stains by combining three tablespoons of white vinegar with one cup of water before soaking the stained area with this solution.

Here's how to use baking soda on an underarm stain. Create a paste of baking soda and hydrogen peroxide, mixing one part of each in a bowl. Then, add one part of the water.

The best armpit stain removers for tackling tough sweat stains on clothing are household cleaners you likely already have at home, like baking soda, hydrogen peroxide, oxygen bleach, and vinegar.