The answer to 'grout neglected' is that neglected grout can lead to a number of issues, including discoloration, staining, and even mold growth. Over time, the grout can become cracked, crumbling, or missing altogether, which can allow water to seep through and damage the underlying surface.
To address neglected grout, the first step is to thoroughly clean the affected area using a grout cleaner or a mixture of warm water and mild detergent. This can help remove any dirt, grime, or mold that has built up. Once the area is clean, you can consider re-grouting the tiles or replacing the grout entirely. This is generally a DIY-friendly task, but for larger areas or more complex projects, it may be best to call in a professional cleaning service.