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How to remove mildew from sheetrock
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.
Prepare a solution of one cup chlorine bleach with water to make one gallon. Pour your solution in a spray bottle.