To remove beet stains from bricks, wipe up the excess stain with a soft cloth. Wash the bricks with a solution of washing soda or detergent with water. Use a cloth or soft-bristled brush to scrub the bricks and rinse thoroughly with clean water.
Mix one part of detergent or washing soda with enough water to make solution and spray it on the bricks. Scrub it using a brush or a clean rag until the beet stain disappears. Rinse the bricks thoroughly with clean water, and allow it to dry completely.
For stubborn beet stains, use chlorine bleach instead of detergent. Add a 10 percent solution of chlorine bleach to the water, and spray it on the stains. Allow it to soak for 10 minutes, and scrub the bricks with a brush thoroughly until the stain disappears. Rinse with water, and allow it to dry. Use rubber gloves and eye protection while using chlorine bleach.
To use boric acid to remove beet stains from bricks, add 1 tablespoon of boric acid to 1 gallon of warm water. Dip the scrub brush in the cleaning solution, and scrub the surface of the bricks thoroughly. Rinse away the solution from the bricks using warm water, and allow the bricks to dry.