Why Bathroom Mold Returns After You Clean It

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You scrub that black gunk off the grout and shower walls, but within a week it's back. That's because mold spores are tiny and airborne, floating in the air and landing on damp surfaces as soon as you're done cleaning. Even if you kill the visible mold, those invisible spores survive deep in porous caulking and tile, waiting for moisture to grow again. The real issue isn't the mold you see, it's the humidity and poor ventilation that let it thrive in the first place. Without tackling the source…