The answer to 'grout dirty' is that dirty grout is a common problem in bathrooms and kitchens. Grout can become discolored, stained, or mildewed over time due to a variety of factors, including water exposure, soap scum buildup, and mold growth. Symptoms include dingy, discolored grout lines that detract from the overall appearance of the tile.
There are several potential solutions for dirty grout, depending on the severity of the issue. For light staining or discoloration, homeowners may be able to clean the grout themselves using a grout cleaner, scrub brush, and some elbow grease. However, for more stubborn stains, mold, or deeply embedded dirt, it's often best to call in a professional cleaning service that has the right tools and techniques to properly restore the grout.