
The best thing I found to use is a piece of Sponge in some Nylon and you rub the spot, wulla it should be gone...We use this at work on shirts with deoderant on them and it works great, then just wipe off...Most clothing stores do this to their shirts, because when people try them on they leave deoderant under the arms and well you can't have that hanging out for other people to try on.
Good luck and lemme no how it worked