Wait for the iron to cool before cleaning it.
Put a nickel-sized amount of plain white toothpaste onto a damp rag. Avoid using gel or abrasive toothpaste.
Scrub the iron plate with the rag to remove the buildup. Rinse the plate with a clean, damp rag and dry it thoroughly.
Moisten a clean rag with white vinegar if any starch buildup remains. Scrub the plate with the vinegar-soaked rag. If the buildup isn’t budging, use a steel wool pad and vinegar to scrub the plate. Rinse and dry the plate thoroughly.