This is recommended if the material has remained wet for more than 24 hours or if the material has been repeatedly wet or dampened. If you see large amounts of mold growth on porous surfaces, you may want to consider hiring a professional to remove the material. If you decide to do the work yourself, it is important to use a good respirator and keep children and pets out of the area while work is underway. Using a weak bleach solution on such surfaces, or painting or sealing over sheetrock and ceiling tiles after water or moisture damage, is only a short-term solution. While the very top layer of mold may have been removed, the mold beneath the surface is unlikely to have been affected and will continue to grow.
Good cleanup is important.
If there is a water leak, be sure to take steps to stop the leak before you replace or repair. Limit the use of humidifiers, especially in tightly enclosed areas. If you decide to use a weak bleach solution or other special cleaning product, carefully read and follow label instructions. Also, provide enough fresh air. If you are sensitive to chemicals found in cleaning products, either have someone else do the work in a safe way or look for other cleaning products.