Hi Rick,
Rust should never be left alone.
There are several ways to treat the rust you describe. I think that were the piece mine, I would give the strawed but rusted pieces a good long soak in a very high grade light weight machine oil for several days to soften the rust. Then I think I would get some clean burlap and moisten it with oil and give the parts a judicious scrub, being careful to use only the pressure necessary to dislodge the rust and avoiding any damage to the strawing. After successful cleaning, I would then coat the parts with Renaissance Wax to seal them.
My zwei pfennigs. Suggest others here, particularly Thor, may have some magic potions they use for such things.
Tom A.
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