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I found two ways to remove under arm stains (from About):  

• The 1:1:1 – One part baking soda, one part hydrogen peroxide, one part water. Make a solution of the three ingredients. You will need about 1/4 cup each of baking soda, hydrogen peroxide and water to treat one shirt. Protect your countertop or work area with a thick white towel, rub the 1:1:1 solution into stains and allow to work for at least 30 minutes. Use an old soft toothbrush or bristle brush to loosen any residue and then wash as usual in warm or cold water.


• The 1:1 – One part oxygen-based bleach (OxiClean, Clorox 2, Country Save Bleach, Purex 2 Color Safe Bleach), one part household ammonia. DO NOT USECHLORINE BLEACH. In a well-ventilated room - wearing rubber gloves - mix solution well – about 2 tablespoons of each ingredient per shirt. Again, protecting your countertop or work surface with a thick white towel, rub solution into stains for at least 30 seconds. Allow to work for 5 to 10 minutes. Wash as usual in warm or cold water.