Brush over the mildew spots with a stiff scrub brush. This will remove as much loose mildew from the surface as possible. If the brick surface is indoors, lay down plastic sheeting on the floor below to protect the area.
Fill a bucket with one gallon of warm water. Add one cup of liquid chlorine bleach.
Spray down the brick with water. For outdoor brick, use the garden hose. Spray indoor brick with water from a spray bottle.
Dip a clean, stiff scrub brush into the bleach mixture. Scrub the mildew spots vigorously with the bleach and scrub brush until they are gone. Rinse the scrub brush frequently into the bleach mixture so you don't reapply mildew to the surface.
Rinse the brick thoroughly with plain water from the garden hose. If the brick is indoors, fill a clean bucket with water, then use rags and water to rinse off the brick.
Things You Will Need
- Stiff scrub brush
- Plastic sheeting
- 1 cup liquid chlorine bleach
- Garden hose
- Spray bottle
- Mildew on outdoor brick can also be removed using a power washer. Choose a power washer with 3,000 psi or less to avoid damaging the brick. Use a wide spray setting and hold the nozzle about 12 inches from the surface. Move the wand back and forth over the spots until the mildew is gone.