My brothers and I are looking to clean up and possibly restore a set of German field binoculars from WWII (brought back to the states by my grandfather). They are unfortunately in poor condition, fastened in a display case for years with a copper wire which reacted with and corroded the aluminum body. The areas where paint was worn were hit the hardest. I'll start with vacuuming and brushing. Any suggestions on how to gently remove the remainder of corrosion? It seems baking soda isn't recommended for aluminum.