Help! The previous owner of my house cemented over (concreted?) the brick fireplace in my living room, and had hideous marble put over it. The marble was not layed correctly so it looked bad all over. I have gotten all of the marble off, but it looks like they restructed the outline of the fireplace using concrete. How do I remove this? We chiseled off the marble and are grinding off the leftovers, but there are some areas that are inches deep. Thanks!