I just purchased a Singer 128 with the Crinkle/Blackside finish for $15. It resided in South Texas near the coast and it has rust showing through in places of the crinkle finish. What would be the best way to clean it up since it doesn't have the shellac finish? It mostly looks like surface rust and the rust isn't bubbly (thankfully). The slide plates and face plate are also black (not silver), would I put those in Evapo-Rust? I would like to restore her as all her parts move although the veneer is missing from both ends of the bentwood case. Thanks so much for any help!