A freshly washed shirt, an iron at the right temperature - and then a stain. Not on the table, not on the floor, but exactly where there was no stain on the shirt before. If this has happened to you, you are not alone. An iron that leaves marks is a silent household bug - outwardly innocent, but in practice capable of ruining even the best piece of clothing. The good news? The problem is common and usually solvable. It's time to clean your iron.