Plastic changes from a solid to a liquid when subjected to heat. This chemical process can be witnessed firsthand when a plastic spoon or bag comes in contact with a hot cast-iron object such as a pan. What is left after the encounter is a melted mess that is very difficult to remove. When allowed to cool, the plastic hardens to its original state and remains stuck to the cast-iron pan.
Place the cast-iron object in the freezer and allow it to chill for 2 or 3 hours.
Remove the item from the freezer and place on a secure, flat surface.
Chip away at the frozen plastic with a spatula or other blunt object.
Soak a cloth with a quarter-sized puddle of nail polish remover.
Wipe the melted plastic with the cloth saturated in nail polish remover. Keep rubbing until the plastic is removed.
Wash the excess polish off the surface with dish soap and warm water.
Spray the surface of the melted plastic and surrounding area with a silicone spray such as WD-40 3-in-One.
Peel up the spray and the plastic using a razor blade.
Continue scraping plastic until it all has been removed. You might need to add more spray for tough-to-remove areas.
Wipe any excess silicone spray off the surface once all plastic is removed.