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Only if one does not have much concern about preserving the room, though, yes? Maybe fresh air. Idk, I have lived with houses not equipped for modern plumbing, i.e., bathrooms that had no ventilation or fans. Those were the ones that grew mold. Vinegar helps. So might a dehumidifier (never tried it). Unless the room is specifically built to prevent mold from growing, though, the answer is admittedly aggressive, repeated treatment. I would not have set fire to the bathroom to get rid of the mold. In one house, we let it accumulate, and then scrubbed the bathroom clean occasionally; in my current house we leave a window open at all times for ventilation (though that impacts our AC costs, and I shudder to think what we will do in winter).