removing file from Hg control

[Soh Tk-r28629]

> I would like to remove some files from being managed by Hg, that I
> accidentally checked in much earlier. I have tried to remove the files
> from .hg/data/, which seems to work, but I'm not this is the right thing
> to do. Comment?

Just checked again. Looks like simply removing .hg/data/file.[id] didn't do it. Hg manifest still show the file. What can I do?