Repeated mold growth in bathroom tile grout usually happens due to constant moisture, poor ventilation, and soap residue buildup. To deal with it effectively, start by cleaning the grout with a strong mold remover or a mixture of vinegar and baking soda, scrubbing thoroughly with a stiff brush. After cleaning, make sure the bathroom stays well-ventilated by using an exhaust fan or opening windows to reduce humidity. Fix any leaks or water seepage around tiles or plumbing, as hidden moisture can quickly bring mold back. Once the grout is clean and dry, applying a grout sealer can help create a protective barrier that prevents future mold growth. Regular cleaning and keeping the area dry after showers are key to stopping the problem from returning. 
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