Abandon In Place.
Run new wire, cut the old off where it enters the outlet or switch boxes and shove the remainder back into the wall and leave it. Same at the breaker box, cut the old off at the ceiling joists and shove it back into the holes.
Removing it can be very difficult. I've been lucky in some cases and could grab old Romex with a pair of vise grips and pull it down into the basement when it wasn't stapled in place properly. That won't happen with knob & tube. Walls would have to be cut open. I don't believe CoD would require that as long as everything was cut off at both ends so that it couldn't be energized.
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