How do you remove rust from rock?

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I have a few rocks that I would like to use as border decoration, but they have a lot of discoloration on them - looks almost like rust. Does anyone know any tricks to remove this coating, whatever it is? It's not the natural color of the rock, but I'm not sure what it is that turns them unless they are just exposed to the elements for a very long time. Thanks!

q how do you remove rust from rock
q how do you remove rust from rock
  8 answers