1.   A power grinder can quickly remove stubborn mortar, but if used carelessly it can damage the bricks, as well.

2.   Either way, the task must be done carefully to avoid damaging the brick and safety goggles must be worn to protect your eyes.

3.   However, this can damage the bricks if not used carefully.

4.   Sand blasting is expensive, can damage brick and might not get rid of all the stains.

5.   What is the best way to remove these without damaging the bricks?

6.   Erosion due to wind and rain has damaged bricks and is causing the foundation to sink, Xinhua said.