what causes your white shirts to develop a yellow stain in your armpit area?

Question

Bonus points: is there a way to get rid of them?

In: Biology

Answer 1

Sweat. You’ll get it around your collar as well. You can buy whitening powder in shops which might work, depending on how bad it is. If it’s a pure white shirt you might be able to use bleach as well, but check the label first.