I just bought a Bourgeat carbon steel frying pan that I seasoned earlier today. Put the pan on the burners with oil until the whole bottom of the pan was black. I just fried some marinated beef short ribs on my new pan, but all the juices used to marinade formed a burnt layer on the pan. I have no idea how to clean this as it is quite tough. I tried scrubbing it with soap and sponge but it doesn't come off. In a panic, I reached for the steel wool (huge mistake?) and gave it a gentle scrub but some of it is still on there. Please help!