While you need to address these mold concerns ASAP, it s also important to know what causes mold growth in bathrooms so you can prevent it .Here s how to kill bathroom mold and prevent it and mildew from reoccurring. a bathtub, shower, or entire bathroom remains damp enough for mold growth just from Lingering moisture caused by lack of ventilation Leaky toilets, sinks, and .Causes Why and How Mold Grows in the Bathroom. If you don t dry this moisture out quickly it can easily lead to mold growth. On top of this, when the water in the bathroom does dry out it evaporates into the air and increases the humidity. Steam from the shower or a hot bath also makes the bathroom more humid..Bathrooms are a natural breeding ground for mold. Without the proper ventilation, the excess moisture will cause mold to grow. Leaky plumbing can also contribute to mold growth. If your toilets, sinks or pipes drip and you don t notice soon enough, the standing water could create a serious mold problem..
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