I am working on renewing a cast iron skillet that I got from my mother. I have soaked in vinegar water and got most of the rust off but still can't seem to get it all. Also I keep getting black residue when I wipe it. I know this is a work in progress, but I was hoping for
more tips or info on what I can do. I watched JC's video on it but so far that has not been enough. Any help would be appreciated, this was my grandmother's skillet, and I really want to be able to use it. Thanks.