mold, sheetrock

If a wall always needs to breath or otherwise has mold (eg. behind a hanging picture), then it's sheetrock needs to be replaced right?
Has anyone tried drilling holes at the top of the wall and spraying in bleach/x14 solutions so that it runs down inside the wall?
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Bleach inside the wall will make it even wetter than it already is. Where is this moisture coming from? That is the problem to solve.

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