Hi,

This wallpaper can be washed with mild detergent and a damp cloth, but we would not recommend using anything abrasive on it.
The bricks are life size. There are some darker grey bricks, which can be seen in this apartment:

The wall does not need to be sized before hanging. We do recommend waiting two to three weeks to hang NuWallpaper if you have just painted the walls.

This video shows how install NuWallpaper:

Please let us know if you have any other questions!