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When Sheetrock is exposed to moisture mildew can begin to grow on it almost immediately. To remove the mildew, the problem with the moisture must be corrected first, then try these simple steps.
Remove the source of moisture which is supporting the mildew before trying to remove the mildew. If it is a wall or roof leak, patch or repair it. If it is simply condensation, like moisture in a bathroom or shower, you may need a ventilation to remove humidity from the room.
Read more at: http://www.wikihow.com/Remove-Mildew-from-Sheetrock