HadinEEon Electric Gooseneck Kettle Make the most exquisite pour-over coffee Excellent kettle for morning pour-over and tea. The slim spout lets you create a gorgeous pour with a rather slow stream. It controls where your hot water falls on your ground coffee, allowing you to more easily achieve a balanced saturation. Just master manual pour-over coffee like a barista at home. How to clean mineral deposits in tea kettles Any tea kettle that has seen good use is bound to develop some mineral buildup, especially in the hard water area. Calcium and lime buildups can be dissolved with mild acids such as white vinegar and lemon juice. To remove it, please follow the instructions: 1. Fill the kettle with an equal part solution of water and household vinegar and let this soak for an hour. 2. Once the hour is up, just boil the kettle. 3. Empty the kettle and rinse it thoroughly.