Cedar Shingles and Mildew
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Because it manifests itself as patchy, darkened areas, mildew is frequently mistaken for bleeding or staining. A simple test for identifying mildew is to apply a small amount of household bleach (a 5% sodium hypochlorite solution) to the wall. If mildew is present, the darkened patch will disappear. If it remains, it is likely the wall is just dirty.
When discovered, mildew should always be removed. It will reappear if painted over. Commercial preparations are readily available for treatment. The paint chosen for refinishing should contain sufficient fungicide to help repel future attacks.