Bleach (For Mold, Mildew, and Moss): A bleach mixture is ideal for removing mold, mildew, and moss from exterior brick walls. Combine a tablespoon of bleach with a gallon of warm water in a bucket, then apply the bleach with a sponge to the brick. … Scrub gently, letting the acid remain on the brick for a few minutes.

Can you put bleach on red brick?

Make a cleaning solution using 4 parts water to 1 part bleach. Combine it all in a bucket. Scrape off any moss or mold with a spatula or a stiff-bristled brush. Apply a generous covering of the bleach mixture directly to the red brick and let it sit overnight.

How do you change the color of brick?

Bricks can be either stained or painted. Paint often peels or chips and it lasts only a few years before you have to repaint the bricks. Stain is a longer-lasting solution to changing the color of the bricks.