To clean mold from the ceiling, wash the affected area with a store-bought mold cleaner, or a mixture of dish soap and water. Let the area dry. Now it’s time to get out the big guns to kill the mold—bleach. Mix one-quarter cup of bleach with one quart of water and apply the solution with a spray bottle or sponge.
You may have to remove and replace all your ceiling panels. If it’s a mild case of bathroom ceiling mold, you can use home remedies like borax, tea tree oil, baking soda, vinegar, ammonia, bleach, or hydrogen peroxide. Ordinarily, spraying a concoction on the mold will kill it off.