The heat of an iron is great for setting sharp creases in slacks or pressing wrinkles out of a cotton shirt, but not all fabric will stand up to a hot iron. Some synthetic fibers will melt on contact, leaving you with an iron coated with burnt fabric. Before you can iron anything else, you need to remove the burnt fabric. Unplug the iron and let it cool, then prepare to clean up the mess.
How to Remove Burnt Fabric From an Iron