There are those out there that won’t wear “traditional” deodorant due to potentially harmful chemicals such as aluminum chlorohydrate. Like Tom’s all natural deodorant. I have a friend like this, and he is far from being a hippie. Just kind of a health nut.
Anyway, in October this friend rode along with my wife and I to a wedding in DC. Especially on the way home, the deodorant just didn’t work, and my car smelled like BO. The smell took about a week to go away completely. It was disgusting.