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Mildew

 

Mildew is a fungus. It grows most extensively in warm, humid environments. Most growth occurs at temperatures of 75 degrees to 85 degrees Fahrenheit. Mildew fungi can be distinguished from dirt by placing a drop of fresh liquid chlorine bleach on the area in question. If the discoloration is mildew, the spot will fade or disappear. 

 

Reference(s):

Recipe for Washing Mildewed House Surfaces

More than Normal Rainfall Can Cause Exterior Moss and Mildew Problems for Homeowners