Adam & Evw scales inlay

I just got this nice ADAM-EVE with some etching on the blade that needs to be clean and what apparently seems to be a celluloid scales but without the metal inlaid. I have two questions here:
1. Can someone please recommend me what will be the best way to clean that kind of blade from those dark stains without damaging the etching?
2. Any chance that someone also have a spare ADAM-EVE metal inlaid for the scales? (I added some pictures I found on eBay with the desired inlaid)

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After comparing the silhouette of the empty inlaid in my scales to the ones that shown above I think it is more likely that the firt adam&eve inlaid on the brighter scales will fit my scales.