When they are new you can put a form of silicone spray on them, when they are older we tend to put them in a vice, attach a drill the the handle end and spin them round whilst holding a wire brush onto the thread, cleans them up nicely.
i put mine to soak in a tub of red deisel, leave them over night and they come up as good as new. anold school scaffolder told me that as that is what they use to do with scaffold clips.
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