The answer to 'why is my grout mildew' is that grout can develop mildew for several common reasons, including excess moisture, poor ventilation, and lack of cleaning. Grout is a porous material that can easily trap moisture, providing an ideal environment for mildew growth. This is especially common in bathrooms, showers, and other high-moisture areas of the home.
Symptoms of grout mildew include discoloration, a fuzzy or slimy texture, and a musty odor. To prevent and treat grout mildew, it's important to keep the area well-ventilated, wipe up spills promptly, and clean the grout regularly with a mild detergent or grout cleaner. For severe or recurring mildew issues, you may need to call in a professional cleaning service to properly treat and reseal the grout.