How To Remove Deodorant Buildup From Armpits. Does anyone know how to remove the built up hard yellow stuff in the armpits of shirts? Don't rinse the shirt — just pour off as much of the hot water as you can.
5 tips on removing deodorant stains hydrogen peroxide. Thehowtohome.com then take your shirt and place the area with the deodorant stain in the bowl make sure all of the armpit stains soak up some of the mixture. While smoothing deodorant under your arms is an effective means of preventing body odor, it can leave a sticky and waxy residue on your armpits.