Hi, I've recently bought a small Austrian vertical mill, and when I took the covers off, it became apparent that it was left out in the rain. Only a few areas of the castings are rusted and it looks fresh (bright orange).
What is the best thing to use to take the rust off the gray-iron castings, and to keep it from coming back? I've been told that rust is like a cancer, and that it will often return after you've had it once.
--Maxx