Mold on Windows
Mold on windows is usually caused by cold outdoor air on the other side of the window cooling on the glass causing condensation. Although mold cannot feed on the glass itself, if the window is dirty then mold can feed off of the debris on the window glass and frame material. Condensation can also lead to mold growing around window frames because of moisture condensating on the glass and then running onto the frame. The other place to watch out...
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