This is a very decent and expensive wok bought in the early 90s by my parents and they say it is a perfect work. Yes we 've used it for more than 20 years with no complaints at all but when I fried an egg with it yesterday it develops a lot of black **** like this (see picture below), I could hardly clean it at all with all my efforts, and the wok is stuck with this black thing. This is the first time - We used to clean the wok very easily and painlessly.
1. Why does it happen?
2. How to clean out the black thing?
See picture
1. Why does it happen?
2. How to clean out the black thing?
See picture