1). Natural soaps
Natural soaps like goat milk soap and castile soap are good for removing underarm odor. They kill the bacteria and in that way make the odor disappear.
2). Baking soda
Baking soda has many purposes and this is one of them. It will keep your skin soft during the whole day.
3). Apple cider vinegar
You should combine ACV with some lemon juice, wash your underarm with it and rinse with warm water in the end. You can also pour this mixture in a spray bottle and use it as antiperspirant.
4). Lime
Fresh lime juice is proven to kill even 99% of the bacteria that cause underarm odor.
5). Tea tree
This oil is great anti-bacterial and anti-fungal agent and at the same time it smells really good.
6). Hydrogen peroxide
This is one more option for killing underarm odor in natural way. Just mix a little of it with rosewater and the bad odor will disappear.
7). Stop shaving
Well this is not a remedy, but is a good way to prevent underarm odor. Shaving exacerbates odors. You should know that the skin gets irritated by razor, lotions and creams.