DO's & vinegar

I was not sure where to post this but here I am. I have a book on Pioneer cooking and the use of vinegar. It says that they used vinegar to keep the cast iron cookware from rusting. Does anyone know about this? I was wondering how it was used on the ironware. Would you just wipe it on like you do the oil? I appreciate any answers you might have.
Thanks,
Grani
P.S. I am really not that old.

Thanks,
Grani
P.S. I am really not that old.
