Yellow mustard is one of the toughest stains, so act fast if your sandwich squirts on you. Get it to us, pronto. Our stain experts will get the yellow spot out, and we never charge extra for regular stain removal. The sooner we get to work, the better your chance of stain removal. So celebrate national Hot Dog Month with the works: ketchup, relish, onions and a triple squirt of mustard.