That's my suggestion for anyone who is gonna use there blade for food prep. Just a VERY light wipe as it is used as a
"lubrative laxative, and is often prescribed to ease the pain of bowel movements for those who suffer from hemorrhoids and constipation". [Quote taken from Wiki]
It's non toxic (in SMALL doses), cheap and easy to get.
That's what I use on my carbon blade khukuri to stop the rust. I haven't used the khukuri on food but at least I know I can if needed.