Domestic water has a certain hardness. If the hardness of water is high, the insoluble salt components of calcium ions and magnesium ions (such as calcium carbonate and magnesium carbonate) will be separated from the water when heated, and form scale on the inner surface of the kettle, especially the glass products, which have higher transparency and more obvious vision, but it is actually safer for our own use, and the scale is actually very easy to remove. I'll give you an Amway that I usually handle myself.

1. Pour a proper amount of water into the pot, then add a proper amount of baking soda powder (if you don't have baking soda at home, you can also use white vinegar or lemon slices instead), and the ratio of water to water is about1:5;

Open the lid to boil water, then cut off the power supply and let it stand for about 30 minutes; ;

3. Empty the kettle and rinse it with clean water for 2 to 3 times.

If there is still some residue, it is recommended to wash it with water and wipe it with scouring pad.

I hope I can help you ~ I hope to adopt it, thank you!