I have cleaned a cast iron frying pan that looked far worse than yours.It was thrown out by a shoarma restaurant.You can clean it with a steelwooll pad and if not clean then,you can boil water with a spoonfull of baking soda in it for 15 minutes.After that heat the pan and add some good fat,like coconut oil (it has a high burning point).Be sure that the fat has covered the whole inside of the pan.Now it's ready for use.After use you can wash it with HOT water and a brush or wipe it clean.Always put it away when it is thoroughly dry and be sure the grease film is still there.If not,just greas the pan again when hot.I have my pan for nearly 20 years and it is still going strong!
