The answer to 'grout moldy' is that mold growth in grout is a common problem caused by excess moisture, poor ventilation, or improper cleaning. Symptoms include discoloration, musty odors, and visible mold growth. To address this, you'll need to thoroughly clean and disinfect the affected areas, improve ventilation, and take steps to prevent future mold growth.
For minor mold issues, homeowners can often address this with DIY cleaning methods using a mild bleach solution or commercial mold removal products. However, for more extensive mold growth or if the underlying moisture issue cannot be easily resolved, it's best to call in a professional cleaning service. They have the expertise and equipment to properly identify and remediate the mold problem.