Moss is a type of plant that grows in areas where there is an abundance of direct sunlight, lime and areas that don't retain moisture. Spores from the moss plant travel by wind or animals and can grow easily on brick patio areas. Commercial fertilizers that contain sulfur or iron can kill moss, but are not recommended for removing the moss from bricks. There are simple homemade methods for eliminating moss from brick patios before you need to resort to purchasing chemicals from a store.
Add at least 3 inches of bleach and 1/2 cup of liquid laundry detergent to a large bucket. Stir the mixture well until the laundry detergent has dissolved.
Put on rubber gloves. Pour the mixture slowly onto the area of brick where the moss is. Scrub the area with a long-handled brush. Continue scrubbing and pouring more of the mixture onto the area until it's all used. Allow for the mixture to then soak into any leftover moss for at least 10 minutes.
Spray off the patio area using a strong pressure setting on your garden hose nozzle. Continue spraying until there is no moss left on the bricks.
Use the bleach and detergent mixture again if necessary, or purchase a patio washing product from your local home and garden retailer. Also, for major problems with moss or stains on your patio brick you can purchase a pressure washer.