more mold behind very likely 回複:急, 地下室窗嚴重MOLD, 可以磨掉,重新漆嗎?

The source of the window leakage could only be revealed when you remove the dry wall.

From there, you can seal and leakage, spray on some mold killer then mold blocker.

Place fresh dry wall to patch the hole then paint.

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