You are the manager of a downtown restaurant. Recently, you have begun having problems with graffiti being sprayed onto the outside mansonry walls of the restaurant. You've just repainted and the place looks great, but you don't want to have to repaint constantly. What can you do to make it easier to clean graffiti off the walls?

a. apply a mixture of household bleach, vinegar, and water to the walls
b. use an alkaline cleaner
c. apply a clear acrylic sealer to the walls
d. there is nothing you can do about this problem, beyond repainting when necessary

Ans: c. apply a clear acrylic sealer to the walls