Why does simply scrubbing the top layer of mold off porous material often fail?

Answer

Mold hyphae penetrate deep below the visible surface.

Porous materials like drywall and wood allow mold hyphae (the root-like structures) to penetrate deep below the visible surface, meaning surface scrubbing alone guarantees recurrence.

Why does simply scrubbing the top layer of mold off porous material often fail?

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