Wash the tea kettle with warm water, dishwashing liquid, and use a soft cloth or sponge in the inside. Rinse thoroughly with warm water and dry the outside and the inside after use. Do not wash in the dishwasher. Clean the inside by filling it with half water and white vinegar. Bring the water to a boil and take it off the stove. Let it cool completely and wipe it out with a soft brush or cloth. Dry it completely.  After that fill it with water and boil it again and discard the water. You can clean the outside of the kettle with diluted vinegar and water.