Picture this: You have a big presentation, a wedding, or a crucial first date. You reach into the back of your closet for your trusty, crisp white button-down. It's been hanging there for a few months, safe and sound. You pull it out, expecting perfection, but instead, you're greeted by a nasty surprise. There, ringing the neck, is a dingy, yellow stain. It feels like a betrayal. You know  that shirt was clean when you hung it up. So, why does it look like you ran a marathon