Hand Hammered Pow Wok Pan Stir-Fry Pan with Wooden Handle, Traditional Pre-seasoned Round Bottom Wok, Asian Cuisine Wok Suitable for gas/open fire stove, not suitable for flat electric or flat induction stove. Care Instruction: This iron pan has been precessed anti-rust treatment under high temperature. Oil film has formed on the surface. So don't use harsh detergent as it will damage the oil film. Wash by hand with warm water and dry it on fire. If you don't use it for a long time, please dry it on fire and then brush some cooking oil on iron surface to avoid rusting. If the wok is rusted under improper care, what should we do? Don't worry. If your wok is rusted, wash the rust by vinegar and dry it on fire for 2 minutes and then brush some oil on the surface. Here are some tips for our iron cooking products: 1.There is some oil residue on the surface when you receive our products, please use gentle detergent and soft sponge to wash it before use. 2.The wok is made of iron which is able to supplement iron elements needed by the human body. Not like stainless steel, the iron element is more active, so it is possible to rust. 3.The best way to prevent rust is to use it regularly. Please use as little detergent as possible to clean and keep it dry after cleaning. 4.It will turn from blue black to black after a period of use. This process plays a role in rust prevention. 5.If you don’t use it for a long time, please apply a layer of cooking oil on it to prevent rust. 6. If it is rusted, you can remove the rust with some vinegar, then clean it and then dry it over fire and brush some oil.