Deodorant stains in the armpits are very normal, and just as irritating. A normal, but wrong perception is that it is sweat that creates these stains, but sweat is colorless. What creates the stains is the aluminum chemicals in the deodorant reacting with the body's natural oils. When you wash the garment and the stains come in contact with detergent, a chemical reaction occurs that can even make the stains worse. And when the stains are first there, usually they are hard to get away.
Which method is the best depends on the stain and the deodorant. The most normal and probably most efficiant is to use baking soda. Here's how:
- Mix 3 parts baking soda and 1 part warm water (30-40°C) in a bowl
- Place the stain in the mixture and let it stay for an hour
- Dry off with room temperature water
The method above is most efficient on yellow stains. If the stains are white and hard, you can use lemon soap and rinse off with room temperature water. Never use bleach, as this can make the stains even worse.
The best and most efficient advice is to try and avoid these stains at all. You can use deodorant without aluminum salts, not put on your clothes until the deodorant is 100% dry and not use an unnecessary amount of deodorant.