I have been in the Metal Working trades for the past decade or so after my departure from the rank and file of "Big Brother". But I just recently came across this lil gem of knowledge. Cider vinegar as a rust remover, and let me tell you it removes rust from pretty much anything you put in it. It is a 5% acid solution and it gets to the root of the iron oxide and removes it quick. So far I have tried iron,steel, rubber,plastic and I am sure the list will increase until my shop and the tools there in are clean. There are many links to making your own cider vinegar all over the net. Also one important note you must rinse this acid of and continue to keep your yard sale tools clean ,this is for those of us that "misplace" and later find our weather beaten tools out side. Thanks!