1. Use baking soda: The main ingredient of baking soda is sodium bicarbonate. It has the function of cleaning, and can replace the metal lithium such as calcium and magnesium in the scale to form a precipitate, thereby removing the scale.
2. Use vinegar: Just pour the white vinegar into the bottle, shake it a few times, and put it aside. After more than ten minutes, the bottle is clear and new. Due to the volatilization of the vinegar, the bottle wall is also very clean and does not need to be shaken.
3, with tea water: scale under the action of theophylline, it will fall off some. Even soak for a few times until it completely falls off.