I'm not sure if God can remove blue stain -- I've certainly had no luck despite much effort and many, many different products and methods tried. The problem is that it is actually inside the cell walls and it goes deep into or all the way through the wood, so you can't sand it off.
That being said, I really like landark wood finishes (
www.landarknw.com) specifically the original finish for an all purpose finish. It doesn't add a color, but it does deepen the color already there (including the blue of the blue stain.)
Good luck and if you do find the silver bullet of blue stain removal, I'd love to know it.
