These are scales. Using baking soda can help us to remove scale well. First, pour a spoonful of baking soda into the kettle, then add a proper amount of water, boil it and let it stand for ten minutes, then open the lid and wipe it back and forth with a cup brush several times, so that the scale can be easily removed.

If the scale at the bottom of the pot is too stubborn to be brushed off with a brush, we need to remove it with fresh egg shells. Prepare some fresh egg shells and mash them, then put them in a kettle and add water to boil. After boiling, let it stand for half an hour, and then continue cooking. After repeated operation, the scale will automatically fall off.

Matters needing attention in the use of electric kettle:

1. In order to prolong the service life of the electric kettle, the mineral deposits in the kettle should be cleaned regularly. Be sure to disconnect the power supply when cleaning, and don't soak the bottom of the pot in water when cleaning. Mix vinegar and water at the ratio of 1: 2, pour into the kettle, turn on the power supply, let the kettle work, and wait for it to automatically cut off the power supply.

2. Place the electric kettle correctly. When not in use, it must be placed in a dry place to prevent moisture from reducing safety performance. Pay attention to the electric kettle when boiling water, and put it out of the reach of children. Be sure to cut off the power supply before taking the electric kettle out of the heating socket.

Don't exceed the highest water level when adding water. When using an electric kettle to boil water, the injected water must be higher than the heater and lower than the highest water level line. The general step of water injection is to add water before electrifying.