The answer to 'grout discolored' is that there are several common causes for grout discoloration, including water damage, mold and mildew growth, soap buildup, and improper cleaning methods. Discolored grout can appear dingy, yellowed, or stained, and it may be a sign of more serious underlying issues.
For minor discoloration, homeowners can often address the problem with DIY cleaning methods like scrubbing with a grout brush and a mild detergent or vinegar solution. However, if the discoloration is severe or accompanied by signs of water damage or mold, it's best to call in a professional cleaning service to properly assess and treat the issue.