If nothing falls off of the black stain, it’s likely accumulated moisture. While accumulated moisture is generally not a major issue, it can lead to a phenomenon known as spalling, in which moisture causes thermal expansion. Over time, this expansion can cause cracks, peeling, or other damage to your brickwork.
How do you remove black stains from brick?
- Dark bricks or stone: 1 part acid to 10 parts water.
- Light: 1 part acid to 15 parts water.
- Caution: Pour acid slowly into water; never pour water into acid. Apply as directed, allow to stand for 10 to 15 minutes, then rinse thoroughly.
How do you make bricks look new again?
Scrub the brick with a mixture of dish soap and table salt. Combine 1 c (0.24 L) each of dish soap and table salt to make a spreadable paste, then spread the paste in an even layer over the surface. Working from top to bottom, scrub the paste into the brick with a bristle bush.
