Find it difficult to get enamelled cast-iron cookware clean? Try bringing water to a gentle boil, adding one tablespoon of laundry detergent, and allowing that to boil for six minutes.
You should now be able to rinse it clean with warm water and a sponge. Culinary weblog Chow notes that you'll want to first gently scrub off any food debris before using this method.
How to Clean Enamel Cookware [Chow]