How to get the dark undertone off of your armpits, remove odor and make them silky smooth: 1 tbs white vinegar, 1 tbs baking soda, (secret ingredient!) 1 tsp vanilla extract, mix all ingredients together in a small bowl, then spread across underarms and let sit for 10 minutes with your arm up! Rinse off with a warm wash cloth and voila! Silky smooth, no odor, and no dark spots! MIRACLE RECIPE.