Right, that is your experience. And I'm telling you that there are cast iron fry pans that can defeat wire brushes, both manual and ones you attach to your power drill. (Of course it's up to you if you want to believe me. There's no particular reason to believe some random stranger online, but then again, there's no obvious benefit for me to lie about it.)
Drill with an abrasive scubbing pad on it will sort it out real quick.
That really depends on the condition of the pan. I've had some where power tools were insufficient.
I have yet to see any kind of powered abrasive that WON"T get to the bare metal in a right quick manor. It's kind of what the stuff is made for......
Right, that is your experience. And I'm telling you that there are cast iron fry pans that can defeat wire brushes, both manual and ones you attach to your power drill. (Of course it's up to you if you want to believe me. There's no particular reason to believe some random stranger online, but then again, there's no obvious benefit for me to lie about it.)