The answer to 'grout buildup' is that it is a common problem caused by a buildup of dirt, soap scum, and mineral deposits in the porous grout material. Symptoms include discolored, cracked, or crumbling grout lines. Solutions can range from DIY cleaning to professional regrouting, depending on the severity of the issue.
For minor grout buildup, you can try DIY cleaning methods like scrubbing with a grout brush and a mixture of warm water and mild detergent. For tougher stains, you may need to use a grout cleaner or steam cleaner. However, if the grout is significantly damaged or you have a large area to clean, it's best to call in a professional cleaning service to ensure the job is done properly.