I just read about some guy wanted to remove rust from his fathers old tools, well I used to make, restore and repair furniture, i worked from home and I used old tools. A quiet a few I still have but not used in many years about 26 year in fact. I would also pick up some from garage sale but in a lot of cases rusty, the best I found that killed the rust was Molasses, you could buy it at most hardwares, famers feed their cows this stuff in the old day. you mixed it with water then leave it 2 or 3 hours or a day, on really bad rusty tools may be 2 or 3 days. And it was cheap, did a briliant job on rust, make sure you treat the tool after with kill rust or some rust preventive after you have finish cleaning everything up. I hope this helps anyone who love old tools and uses them like I did.
I was well known in the area for my work, some may remember me as Ben Feltham, things have changed alot over the years I haven't done any woodwork, which was my business name (Wood Work) It's an art that's mostly lost I think these day, a shame.