How can I effectively clean grout to ensure it remains clear and free of dirt and grime?

To effectively clean grout and keep it free of dirt and grime, use a mixture of water and vinegar or a commercial grout cleaner. Scrub the grout lines with a brush or toothbrush, then rinse with water. For tougher stains, use a paste of baking soda and water. Regular maintenance and sealing can also help prevent future buildup.