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Fergmiester is correct - WD40 is a penetrating and water displacing agent. It won't remove rust. And although Naval Jelly does a good job of removing rust, however, whatever you remove the rust from has to be protected immediately (coat of paint or oiled) or in 24 hrs it will be just as rusty as it was when you started. (must be some kind of chemical reaction between the steel and one of the agents in the Naval Jelly). <br /> <br />I've been an aircraft mechanic for 30 years and have learned that the best way to remove corrosion (that's what rust is isn't it?) is by what the FAA calls "mechanical means". Sandpaper, Steel wool, aluminum wool, Scotch Brite etc. to remove the rust and some form of protective coating when corrosion removed (it'll just start rusting again if you don't). Paint is the best, but if you don't want to paint the item, at least give it a very thin coat of good oil.
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