Remove the lid on the pump sprayer. Pour in one part chlorine bleach to four parts of water. Place the lid on the sprayer.
Mix the bleach and water together by churning the handle on the pump or shake the lidded container well.
Spray the moss with the bleach/water mixture. Allow the mixture to remain on the bricks for one to two hours.
Brush away the moss using the bristles of a stiff brush. Use a sharp shovel to remove thick moss growth.
Spray the exposed brick again with the bleach mixture to remove any stains or lingering traces of moss.