Designed for heating in your popcorn machine kettle. Heat'n Kleen popcorn kettle cleaner is packaged in a 31-oz. jar. It is the best inside kettle cleaner you can buy for your popcorn machine. Non-toxic – just heat a few tablespoons in water. Softens and removes carbon build-up in minutes. Then wipe clean, and rinse. Do not submerge kettle. Safer than any other kettle cleaner!