Reason: Every time the pot is used up, the water in the pot will form iron oxide, which is rust.

Treatment method:

1, put the wok on the fire to dry, put pig fat oil or cooking oil into the wok, there will be smoke, which will be evenly spread all over the wok, especially on the rusty parts. Don't brush the pan immediately after oiling. It is better to leave it for more than 24 hours and brush it before use.

2. Do not use detergent to brush the wok. It is best to control the moisture in the dry wok every time you use it, so as not to rust again.