I've tried this a few times and none of the ovens I've had over the years have been successful in removing seasoning with their self-cleaning, so at this point I'm trying to find a machine shop that will be happy to bead blast it and mill the surface flat again. So far, most shops have given me quotes in the hundreds of dollars so I've been waiting until I meet someone that has the capability to just do it in their garage.
Most new cast iron cookware now has a raw surface with lots of pits and bumps from the casting process as well, which doesn't seem to get nearly as smooth and non-stick as "vintage" cookware.
Most new cast iron cookware now has a raw surface with lots of pits and bumps from the casting process as well, which doesn't seem to get nearly as smooth and non-stick as "vintage" cookware.