A few more questions!

Is there any way to clean the metal? It looks like it's worn from age. Anything I should put on it to keep it from getting worse or is that just how it goes?

I'm not sure how to use this viewfinder. I've never seen anything like it...It looks like there are awkward reflections in it and it's not fun to look through (you can't see the reflections in the photo, and the netting is my window screen)

Sorry for being so new to this.