Put on a pair of rubber gloves and check for adequate ventilation before removing existing mold. You should remove any existing mold before applying any mold-inhibiting paint.
Mix 3 tsp. powdered dishwasher detergent, 1 qt. bleach, 2.5 qts. warm water, and 2 oz. household disinfectant in a large bucket. Scrub the affected mold-growth areas with a scrub brush, and rinse thoroughly with cool water. Allow the area to dry completely before repainting with mold-inhibiting paint.
Add 2 tsp. of mold inhibitor to each gallon of latex or acrylic paint. Do not use mold inhibitor with oil or enamel-based paint, as the inhibitor is only soluble in water-based paint.
Mix the mold inhibitor well into the gallon of paint with a paint mixing stick, until no mold inhibitor is visible.
Apply the mold-inhibiting paint to the affected wall or room with a paint roller. Use an angled brush to paint any hard-to-reach areas.