How Do You Get Rid of Dark Underarm Stains

HYDROGEN PEROXIDE. Soak the stain in equal parts hydrogen peroxide and water. … BAKING SODA. Mix baking (or bi-carb) soda into a paste in a 3:1 ratio with water and scrub into the stain with an old toothbrush. … WHITE VINEGAR. … LEMON JUICE.

What causes black armpit stains?

There are various potential causes for armpits becoming darker including: deodorants and antiperspirants (chemical irritants) shaving (irritation and abrasion) dead skin cell accumulation (lack of exfoliation)

Why do the armpits of my shirts get hard?

The Science of Pit Stains There’s a chemical reaction that happens between sweat, aluminum, and the fabric of your shirts that results in not only those ugly yellow stains, but also that sort of crusty stiffness that so often plagues the underarms of our shirts.