The Magic Eraser works great for the vinyl- Joy's restoration album is really helpful with all the directions you'll need. Do a search- it pops up every now and then in threads.

As for silver eye- I think it just depends on the doll. I've heard Addy can't have just the eye replaced, but I know Kirsten can because one of mine had that done. I think they typically just replace the eye or head and not the entire doll.

Have fun with your project!