To remove mold from a bathroom ceiling, start by ensuring good ventilation. Use a mixture of water and detergent to scrub the moldy area, or apply a commercial mold remover. For persistent mold, consider using a bleach solution. Address any underlying moisture issues to prevent recurrence, and replace affected materials if necessary.

Ensure ventilation, scrub with detergent or mold remover, use bleach for stubborn mold, replace materials if needed.