- Mix up the peroxide/baking soda solution.
- Bring water to a boil.
- Place the shirt in the plastic dishpan.
- Pour boiling water onto each armpit stain.
- Pour off some of the hot water.
- Apply the peroxide/baking soda mixture.
- Machine wash the shirt.
- Air dry the shirt.
How do you remove caked on antiperspirant?
https://www.youtube.com/watch?v=18SpGe8oBvg
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.
What dissolves antiperspirant?
- 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.