bzr remove "bin" here and now (and before now) whatever that means!

[Lucio Crusca]

First of all, great thanks for the great tool... bzr took me a few hours to 
learn, and saved me several days thereafter.

Let's move on the topic: I need to remove the "bin" directory from bzr because 
it got there by mistake... and it got also committed in a few releases by 
mistake... 
Now that I realized it, I've already removed it with "bzr remove" and ignored 
it with "bzr ignore", but that all has an effect starting from now only...

can I «bzr remove "bin" from previous commits also»? If yes, how?