I'm using penetrating oil to try to get the rust off of some of the boat tools in my emergency tool kit. This is a harbor freight special that I bought at least seven years ago for my camper. I moved it onto the boat when I started boating. I never use these, but the charter company requires me to have a set like this on board. if I can get the rust off and clean them up, I can save about $100 on another cheap tool kit. The penetrating oil can says it "dissolves rust." We'll see.