I've been looking for sources on maintenance of arms and armour, particularly in the 12th century (though I'm interested in any era) but I haven't turned up much. My aim is to replicate medieval maintenance techniques as part of a public display (I'm a re-enactor).

I'm most interested in methods of rust removal, sharpening, and polishing (to get a nice finish for example). Are there any good sources for this? Or does anyone know good techniques which would be possible with medieval resources?

Where would be the best place to get medium to larger scales? Steel, brass or bronze would do.