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Sure. Light scrubbing with an old toothbrush, diluted simple green, getting inside the scales with a bit of scotchbrite.
Allow to dry and use fine steel wool, scotchbrite pad on the scales...

Do whatcha want, but those steel collars are original. In fact, the whole thing can be sorted nicely in original trim. Possibly without disassembly.

The Greaves should be great with some work. I don't detect too much hone wear. The wedge is probably not deteriorating, but is wedgeless. Cleaning and neetsfoot oil rubbed on heavy with a q-tip for a...