As mentioned, if there is exposed brass, then keeping it dry is key to avoiding further corrosion. A good tooth brushing with a Scrubbing Bubbles soak may get rid of the corrosion. Use a hard bristle tooth brush. Adding grit in the form of toothpaste may also do the trick.
If plating is thin though, I would think twice about polishing MAAS or Flitz (my favorite).
And don't put a razor away wet. Think of it as a vintage tool.