I have a 64 C30 that came with the factory "chrome" grill. It is in great shape, except it is tarnished a bit. I have tried to polish it with various compounds and buffers to no avail. Does anyone know if these were aluminum, or stainless? I'm not sure how to get this thing to shine again.

1964 C-30 http://s1179.photobucket.com/albums/x383/autoart3/64%20one%20ton%20dually%20flatbed/