How To Remove Deodorant Buildup From Armpits. Once the paste is off, rinse the area completely in the shower. Fill a spray bottle with hydrogen peroxide and spray it directly on the armpit stain.
Apply the solution to the affected area and use your knuckles to rub it into the garment. Gently rub the paste off with a wet washcloth — you definitely want a little exfoliating action here, but not too roughly since armpits are super soft, sensitive skin! It is unsightly and uncomfortable to wear as it is very hard, let alone looks dirty, even if.