Polystyrene sticks to soft PVC. I also have cables with a layer of polystyrene stuck on some places. If you bend the cable the polystyrene is easy to peel of.
Also, phosphoric acid is used to de-rust. It is contained in a range of industrial rust removers, sometimes even as a non-leak gel. Some people even say Coca-Cola contains enough of it to work (I cannot confirm as I use directly the acid which is with necessary caution imho the best).
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