Possible Clues:

• Workers on the surface
• Does their work make them go up the wall?
• Does their work make them go totally up the wall?
• They tend to be coming up against a brick wall with those adding a veneer to the panel
• They leave their coats on the wall
• On the surface they cover pharmacy item found in hospital direction
• They cover the walls and later press for repairs
• They provide the key that secures their coats