My husband and I are redoing one of the bedrooms in our 100+ year old house. The plaster on the walls was literally crumbling. We have torn all the plaster out and are planning to insolate and drywall. The chimney goes through this bedroom. We found while removing the plaster that the chimney bricks are in good shape. I would like to restore (basically clean up) the bricks and add it to the decor of the room. Any advice? I have pets and small children so I would like to avoid harsh chemicals. Thank you for your advice.