I've got a pile of old bricks taken from when my chimney was deconstructed as it was an earthquake risk.
They look like this
I'd like to reuse them since they're fire bricks I assume, so I might be able to experiment with building a rocket stove.
So what's the best way of cleaning off all the mortar? Use a chisel? Or borrow a multitool with a diamond cutting head to remove the mortar?