Unplug the teapot and fill it with equal parts warm water and white vinegar. Wait for about 20 minutes as the vinegar dissolves the lime.
Sponge out the inside of the teapot with a cleaning sponge. Wipe the outside of the pot as well.
Rinse the teapot with water.
Fill the pot with equal parts water and white vinegar once more.
Plug the teapot in and allow it to heat.
Unplug the teapot and pour out the liquid.
Run plain water through the teapot several times to cleanse the vinegar taste and smell.
Wipe the teapot clean with a lint free cloth before storing it.