Thread: Thoughts on cleaning Damascus

So I just got a hold of this Wosty frameback. It's actually the second one of these that has come my way, but the first had a plain steel blade. This one is etched "Damascus Steel" and has a pattern on it as well. I have no idea what kind of steel the blade is actually made of.

Unfortunately, there is some staining/buildup of stuff on the blade. I've included a picture of the front (which is worse than the back) so you can get an idea of what I'm talking about. I don't think it will be possible, but does anyone know of a way to clean this up without losing the etching/pattern?