Lime scale is the hard, white chalky residue found in teapots. If you do not remove lime scale from your kettle, more energy will be required to boil water, and your water will taste bitter. Removing lime scale build-up is a simple task, which you should do every few months to keep the inside of your kettle clean.
Pour 2 cups of white distilled vinegar into a jug of water and mix thoroughly.
Pour the mixture into your tea kettle, filling it no more than 3/4 of the way full.
Bring the mixture to a boil.
Leave the mixture to simmer for 10 to 15 minutes, then allow it to cool.
Pour out the mixture. The lime scale should be gone.
Rinse the tea kettle several times with fresh water. Fill it 3/4 of the way full with plain water and bring the water to a boil, to get rid of any lingering vinegar taste. Once the water has come to a rolling boil, remove it from the stove and pour out the water.