Unless there is a literal hole rusted through it, grab some sand paper and sand the rust off of it. It’s just iron. I’ve done it many times to rescue an old skillet or Dutch Oven.
Short of taking a sledgehammer to it, it’s nigh on impossible to destroy cast iron cooking pans.
Even if it does rust accidentally, can’t you just scrape or buff out the rust and then reseal/reseason it again and it’s fine?
Unless there is a literal hole rusted through it, grab some sand paper and sand the rust off of it. It’s just iron. I’ve done it many times to rescue an old skillet or Dutch Oven.
Short of taking a sledgehammer to it, it’s nigh on impossible to destroy cast iron cooking pans.