A reader named Barry asked: Any advice on getting rid of underarm perspiration stains from white and blue cotton shirts? Thank you.

This is a common one and easily resolved with a few simple steps. It’s important to know that pit stains are not caused by perspiration but by the aluminum in antiperspirant. In the interest of prevention, the first thing to do is to stop using antiperspirant that contains aluminum and switch to a deodorant that doesn’t.