2. Baking Soda
Baking soda is one of the ingredients used to make cakes. Baking soda is able to remove stubborn stains anywhere, even on the armpit skin. You do this by mixing baking soda with water until the mixture becomes thick.
Then apply the armpit with the baking soda solution and leave it overnight. Besides being able to whiten the armpits, baking soda can also be used to eliminate body odor.