Published at Wednesday, August 08th 2018, 00:53:55 AM by Rosa Black. Shower Curtain. When the curtain is quite dirty, pre-treatment is required to ensure that a single wash will effectively remove all the dirt. In cases where there is mildew or mold, the person cleaning them needs to be more cautious. It is a good idea wear proper masks, glasses, and gloves to prevent respiratory and other ailments. Next, a quality bristle brush should be used to clean the mold from the curtain.