How can I effectively clean and maintain the grout in my bathroom to keep it looking fresh and clean?

To effectively clean and maintain grout in your bathroom, mix equal parts of water and vinegar in a spray bottle and apply it to the grout. Let it sit for a few minutes, then scrub with a brush. Rinse with water and dry thoroughly. To prevent future staining, seal the grout with a grout sealer. Regularly cleaning and sealing the grout will help keep it looking fresh and clean.