armpit detox Her recipe calls for 2 tablespoons of bentonite clay, 2 tablespoons of apple cider vinegar and 2 teaspoons of water. You can also add 2 drops of coriander essential oil and 1 drop of rosemary essential oil to the mixture. Apply the mixture under the armpit and let it sit for 5 to 15 minutes. (Those with more sensitive skin should only let it sit for five.) Then all you need to do is wash it off.