The wall is written with black ink to drill wells. What should be used to demolish the external wall?

Dip a little white wine in toilet paper and wipe it hard on the notes on the wall until the handwriting disappears.

At this time, it is recommended to soak it with a rag, so that there will be no scraps of paper like a paper towel, and then wipe it on the stain, so that the stain can be easily removed and the alcohol volatilizes very quickly, without causing any damage to the wall.