Antiperspirant or Deodorant Stain Treatment
First of all, is the stain old or new. If it is an old stain, apply white vinegar and let sit for about 30 minutes. If it is new, apply ammonia and let sit for about 30 minutes. (Test ammonia in an inconspicuous spot to make sure it won’t damage the fabric.) Rinse from the fabric and apply a laundry prewash stain remover. Wash in the warmest water the fabric will allow. Always make sure any stain is out before drying. Repeat if necessary.