How to clear the advertisement of wall paint

First of all: if the color is dark, such as red, you need to use the shovel tool to remove the paint from the advertising part. If it is very light and tired, don't deal with it.

Step 2: repaint the wall with the same color paint or lime powder, and repaint the advertised or smeared part.

Thirdly, color it many times to ensure that there are no visible buildings in the light.

Finally, hang a sign next to it and write a warning message that you are not allowed to brush advertisements.