I have an old house built in 1813. The house has brick walls on each end. During the mid 1800s, the house had additional smaller portions joined to it. When they did this, one end of the house exterior wall became an interior wall. The problem: they plastered over the beautiful brick. I would like to remove it and it seems to be a nightmare to do that. Any time tested tricks or suggestions? Chipping away with a knife or scrape really isn't cutting it. Thank you.