Cleaning Interior Brickwork
Interior bricks may be dusted with vacuum cleaner dusting attachments. Freshen periodically with commercial brick cleaner. If the bricks in question were sealed before they were installed, it will be much easier to keep them clean. Vacuum regularly, and occasionally damp mop using a string mop with plain water to remove soil. When more heavily soiled, the bricks may have to be cleaned using a mild detergent solution and possibly a scrub brush mop as well. Rinse them well, and wipe dry for greater sheen.
Damp-mopping after vacuuming will prevent dirt from building up. Try putting 1 cup of vinegar in the mop water to make the floor shine without being polished.
Cleaning Interior Brick Floors
Interior brick floors may be cleaned with a solution of a moderately strong alkali such as washing soda or borax. Use about 1 tablespoon in a gallon of warm water, stronger if needed. Use either a string mop or scrub brush mop; spong or flat cloth mops can get shredded on the coarse brick. Rinse well to remove all solution.
If the bricks have been sealed, you may find white or gray dust tracked over both that surface and into carpeted floor areas when you have finished. The whitish dust is from the grout used in laying the floor. This generally means that the bricklayer used muriatic acid to clean up the floor surfaces when he completed the job. You will need to keep flushing with clean water until the muriatic acid no longer leaches lime from the grout; causing the whitish dust. Most bricklayers today use a commercial product that is easier to wash off, but also more expensive.
Sealing a brick floor or fireplace will make it easier to clean. However, experts recommend against it because it will seal any moisture that is already in the brick inside the brick, and interior moisture may not be able to escape. Allowing bricks to breathe is important.