I don't know. Long ago I bought a bunch of cast iron pans, still have most of it, from some guy selling army navy stuff out of a quonset hut on ninth and Colorado in what is now a richy place, Santa Monica. I mostly am mad at myself for giving away the pancake pan that fit over two burners.
I did whatever I read about seasoning them and life was fine. I messed up a middle pan and it's gradually coming back to even.. after I looked up what to do, which was season again.
Once revisiting L.A. I stayed at a neighbor's and helped him cook and, good grief, he had a quarter inch of oil over his cast iron pans. (He was a marine, and adamant.)
That was quite a stay - 911 woke us up (in our separate rooms should there be interest) and I found out I had breast cancer that visit, long ago now.
Anyway, I figure there are sites that tell you what to do about this.
I'd be interested in whether you should - or should not - just wire scrub it off with those wire scrubs you find in grocery stores... and then re season.