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The fan will help deter mildew growth by circulating the air and removing moisture.

Summary:
Create a cleaning solution by mixing 1 cup (240mL) chlorine bleach with 1 gallon of warm water (3.75 liters). Rub the affected area with a brush or rag dipped in the solution. Rinse the area with water after the solution has been allowed to sit for a couple of minutes. Turn on the vent fan, if available, upon leaving the bathroom.