The answer to tough stains on grout is that they are often caused by a buildup of dirt, grime, and mildew over time. Symptoms include discoloration, staining, and a rough or uneven texture in the grout. Solutions can range from DIY cleaning methods to hiring a professional grout cleaning service, depending on the severity of the issue.
For minor stains, homeowners can try scrubbing the grout with a stiff-bristle brush and a grout cleaning solution. Baking soda and vinegar can also be an effective DIY option. However, for more stubborn stains or widespread grout discoloration, it's best to call in a professional cleaning service that has the right tools and expertise to deep clean and restore the grout.