Once the original surface has started oxidizing, you need to halt the process. Pins might clean up using a pin cushion filled with sand or that emory rock stuff. Personally, I would write those off. They really aren't worth it.
Blades I would leave on the cutter to handle better and work on one side at a time using naval jelly or emory cloth, etc. After removing the rust in your preferred method you need to provide an oxidation barrier (somthing like your sewing machine oil will work) on the blade (apply with a cotton ball to prevent cutting yourself up). Otherwise the blade will just oxidize all over again.