How to Remove Black Mold Stains From Sidewalks

Black mold on a sidewalk is not only ugly, it's hazardous. Black mold can be slippery if stepped on, and if you spend a lot of time outside it can become an irritant if inhaled regularly. Luckily, black mold is easy to remove from a sidewalk. A soap solution will remove the bulk of the mold. Follow with a mild bleach solution to kill any remaining spores and remove any staining.

Plastic sheeting

Rocks

Bricks

Garden hose

Bucket

Soap

Bleach

Brush

Cover any adjacent grass or other plants with plastic sheeting weighted down with rocks or bricks.

Hose the moldy areas of the sidewalk down with a hose to thoroughly moisten them. The moisture will prevent the black mold spores from becoming airborne and spreading.

Mix a solution of 1 gallon of water and 4 tablespoons of liquid dish-washing detergent.

Pour the solution onto the affected area of the concrete. Cover even mold-adjacent areas (at least 2 feet on each side of the visible mold) as they may harbor invisible spores. Apply enough of the solution to soak and saturate the concrete but not enough to create a spill-over that may soak into the nearby soil.

Scrub the concrete thoroughly with a long-handle scrub brush.

Rinse the sidewalk with a spray from the hose. Aim the hose away from any nearby soil and plant life so that the solution drains onto the street.

Repeat Steps 4 through 6 if you find you have missed spots.

Mix 1 gallon of water and 1 cup of bleach in a fresh bucket.

Pour it over the washed area following the instructions in Step 4.

Scrub the concrete thoroughly with a long-handle scrub brush.

Rinse the sidewalk with a spray from the hose. Aim the hose away from any nearby soil and plant life so that the solution drains onto the street.

For added protection, wear a filter dust mask when cleaning black mold.