Never, never use the hotel iron. Every one I've ever seen has had minerals, melted ironing board plastic, and other crap on the heated surface. Wear a good quality T-shirt below your uniform shirt, let IT take the abuse from your pits, and change IT every day instead of the uniform short. Hanging up your shirt when you get to the room should keep it pretty wrinkle free. Oh, and remember to wear the chalky kind of deodorant so your shirt pits don't turn blue or green or whatever the hell color they dye the other kind.