Mildew/mold on home's exterior walls

This fall and winter we've noticed mildew growing--and spreading quickly--on the exterior walls of our house, specifically under the eves. How do we get rid of it and keep it from returning?

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I’m not a contractor, but mildew grows when things are damp. Outdoors where air circulates, it would be unusual. I’d guess you have a roof or gutter leak in that area, especially if you’ve had no problems in the past.