For a natural solution for getting rid of black mold, combine one part baking soda with five parts distilled white vinegar and five parts water in a spray bottle.
Alternatively, you can use a chemical-based mold and mildew remover, all-purpose cleaners, bleach or dish soap.
Homeowners can handle cleaning about 10 square feet (roughly 3 feet by 3 feet) of black mold on their own.
If the patch is small enough, a combination of bleach, water, scrubbing, and ventilation should do the trick.