Fill the kettle with a mixture of water and white vinegar (2/3 water and 1/3 vinegar).
Bring to the boil (100°C) and leave to work overnight.
The next day empty the kettle and boil water in it several times until the vinegar
disappears completely.
To remove any remaining limescale use commercial descaling products. Do not try to remove
the limescale by scraping or scratching the inside of the kettle.
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