Mayayana was thinking very hard :
Are you serious? He said most of it's stuck. What
you're proposing probably means several *days* of
scraping work, then skim coating the entire wall
with joint compound after getting it hacked up.
All for no good reason. Anyone who had to do such
a thing for some reason would be better off drywalling
over it.

I never said it would be easy. Are you afraid of a little work? ^^

Because a job is difficult and strenuous
that makes it useful? You're not making
any sense. It's a cruel practical joke to
suggest what you suggested. Unless you
really don't know any better. In that case
you shouldn't be giving people advice.

That is how I would prepare a plaster wall. Your milage may vary.