Hi Carrie, sorry you are dealing with mold on shower ceiling. Hope this video will help you. Search Results
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How to prevent and remove bathroom ceiling mildew - YouTube
when you get done showering wipe ceiling,walls,shower doors dry with towel;keep bathroom door & shower doors open so air can circulate;spread shower curtain out so moisture evaporates;use or install fan/vent;wipe the ceiling & inside shower area with straight vinegar kills mold spores
Hi Carrie, once you clean it off, keep it dry, so after each shower use a squeegee or a towel to dry up all the moisture, it will prevent mold growth as it needs moisture to grow.