What about Ballistol? It's FDA or USDA (CRS over 40 years old!) approved for use around food equipment, and it says non toxic to humans on the can. I spray it on leather stuff to soften and repel water, and it is supposed to be good for guns, wood, leather, etc. Also is supposed to be a disinfectant for minor cuts and scrapes. It's been around a looooooooong time. I don't like to use it for a gun bluing rust preventative because it has a fairly strong scent. For knives not used on food products, Corrosion X will stop any rust from forming, stop any old rust from spreading or remove it completely, and is a high rated lubricant also. That's the one I use on my guns and knives. It's said to be biodegradable, but I don't know whether it's nontoxic or not. It tastes pretty bad, from accidentally wiping a drop on my lip one day, bleh! I like to soak new knives with it, work them a lot to flush the gunk out of the backsprings and joints, then blast it out with compressed air until only a film in left on everything. After it dries, the metal repels water like it has wax on it.
