If you find one, it’s not too hard to bring back to life.

All you need is a little oven cleaner.

Let them set for 24 hours before cleaning them off and re-applying if necessary.

Rescue Your Cast Iron From Rust With Vinegar

Again, take care with that stuffit’s extremely dangerous, and should only be handled carefully.

How to Restore Vintage Cast-Iron Cookware| Serious Eats