Hello Rutelebau, thank you for your question. Our specialist service recommends using a vinegar-based solution or, failing that, citric acid. We'll be happy to send you the relevant instructions:
Vinegar solution:
- Fill the kettle with a mixture of water and vinegar (ratio 1:1).
- Heat the solution and leave it in the kettle for 30 minutes.
- Empty the kettle and rinse thoroughly with water. Empty the kettle and rinse thoroughly with water.
Citric acid:
- If you can't find vinegar, you can use a small amount of citric acid instead.
- Dissolve 1-2 teaspoons of powdered citric acid in water, heat the solution and let it stand for 30 minutes.
Sincerely, your M-Infoline team