Don gloves and mix a 1:40 ratio of zinc or magnesium silicofluoride with water in a garden sprayer. Pump up the sprayer by pressing down on the pump nozzle numerous times.
Spray the entire brick wall and grass bordering next to it. Give the moss a couple of days to start drying up.
Add 1 cup of mild dish soap with 5 gallons of water in a bucket. Use a stiff cleaning brush to scrub the dead and dying moss plants off the bricks.
Rinse the brick wall with the garden hose. Use a rake to scoop the loosened chunks of moss and move them away from the wall.