1. If the carbon black is burnt, you can brush it off with a soft brush. If there is some dirt, you can add a little vinegar to the teapot and remove it after cleaning.

2. It is very effective to be able to clean with a cleaning appliance with a friction agent such as toothpaste or soap powder.

It is best not to boil the teapot until it is cleaned. Gray-black is the residue of burning metal materials, and the dispersed heavy metal components exceed the standard, which is harmful to the body.

Second, the kettle scale cleaning method

1. Green lemon method for scale removal

Chop a green lemon, boil it in a pot, soak it for a while, and the dirt can be easily removed. Shopping malls also have professional cleaning solutions to remove scale. The key ingredient is sodium citrate, which has the same effect as green lemon.