3 ms·

Adding a little vinegar and water and boiling it will often remove most of the scale. Maybe hard when you're travelling, but at home it works fine.

• eru 4y ago
  Citric acid is commonly used in Germany.
  • nijave 4y ago
    With the added bonus it (imo) smells better. In the US, you can usually find it with pickling supplies or in the cleaning section as coffee pot cleaner