To remove wall mold, use a solution of chlorine bleach and water on the mold, and use a stiff brush to scrub the infected area. Rinse the wall thoroughly, and allow it to dry. Seal the dry clean wall to prevent moisture penetration, and use an electric dehumidifier near mold-prone walls to prevent future infestation.
Wear adequate protection from contact with mold, especially in cases of severe infestations. Rubber gloves, a mask, eye goggles and long clothes are all necessary. Mix one part chlorine bleach with three parts water or use a household detergent with bleach. Open all windows for good air circulation while working, and scrub the infected wall with a stiff brush until the wall is clean. Allow the solution to sit on the wall for a minute before rinsing it thoroughly. Reapply the cleaning mix and allow it to sit for a minute or two before scrubbing the wall again if the mold doesn't disappear with the first scrub.
Wait until the wall dries, and wait for a couple of days to ensure that the mold does not reappear. Seal all wood surfaces with an oil-based primer, and repaint cleaned walls with a latex or anti-mildew paint to prevent future mold growth. Install an electric de-humidifier in badly infested parts of the home to prevent mold infestation in the long run. Upgrading home insulation and keeping the home well-ventilated and dry cut out dampness and prevent the return of mold.