subject: Tried and Tested Methods to Beat Armpit Sweat [print this page] The next treatment involves the use of baking soda. Here the baking soda acts as an alkaline and the body's sweat acts as an acid and thus mixes together to evaporate the sweat. This can be used by applying a paste of baking soda in water to your armpits and then allowing 25 minutes of a dry time. Later all you need to do is dry your armpits and repeat the procedure for several days to get positive results.