Empty the iron of any water and set it on low.
Scrape off the melted adhesive after it softens, using a piece of smooth wood or a wooden utensil, recommends Michigan State University.
Turn off the iron, unplug it and wait for it to cool before cleaning off the rest of the adhesive.
Pour 1 tsp. of baking soda in a small bowl. Add just enough water to make a paste. Dip a rag in the paste and scrub off the remaining adhesive. Wipe the sole plate clean with a damp rag.
Clean off any stubborn adhesives with toothpaste or silver polish. Dab a bit of either one on a rag and scrub the sole plate clean. Use a damp rag to rinse.
Moisten a cotton ball with nail polish remover and wipe the sole plate clean. What you think may be melted adhesive may be melted polyester, which can often come off with nail polish remover.