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You also want to be sure to spread out your shower curtain so that it can dry evenly. This will prevent any potential mold build up. Another fast way to ventilate your bathroom is to crack a window if there is one. If you have mold already in your bathroom and want to get rid of it then there are two possible approaches to consider. The first approach is to get a face mask that will keep you from breathing in mold spores. http://www.thehayloftonline.com/understanding-bathroom-mold/