If the deodorant has been sitting for a while you should apply distilled white vinegar to the stained area, allowing it to sit for approximately half an hour. Rinse the vinegar from the fabric and apply a laundry prewash stain remover. Launder in the hottest water the fabric will allow to get out the stain caused by the deodorant. Make sure the stain is gone after washing, but before you place in the dryer or you may set the stain. Repeat if necessary.