Because cleaning treats the surface and the moisture treats you to a sequel. Growth that returns at caulk lines within weeks is being fed from behind: a pan leaking at its edge, tile over a failed backer, a supply line weeping inside the wall, or an exhaust fan that vents into the attic or nowhere and leaves the room's moisture in the assembly. Bleach lightens the stain and leaves the roots and the water both. The assessment that ends the cycle reads moisture inside the wall, and the scope that ends it corrects the source in the same visit as the removal.
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