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You should take heavy duty bathroom cleaning products and aggressively get rid of the mold. The only problem with this approach is that you may miss a spot and that could lead to the mold growing back. If you want the job done right then the best approach is to hire a professional, especially if the mold has spread a significant amount. A professional mold remediation expert will be able to quickly and effectively get rid of any traces of mold. This is the safest route. http://www.thehayloftonline.com/understanding-bathroom-mold/