How to clean the throttle and what causes the carbon deposit?

Method 1: Keep the rice washing water or boil the orange peel in a pot, then soak it in it and rub it, which is easy to turn white.

(Magic weapon: Taomi water+orange peel)

Method 2: Remove with ammonia water, that is, add about 2 tablespoons of ammonia water when washing, soak for a few minutes, rub it, then wash it with clear water and treat it according to the general procedure to remove the stains.

(magic weapon: ammonia water)

Method 3: If there are stains on the floor, soak them in cold water, and then sprinkle some fine salt on them to wash them off.

(magic weapon: refined salt)