What is the best way to clean and maintain a tile with black grout in a bathroom?

The best way to clean and maintain a tile with black grout in a bathroom is to regularly scrub the tiles and grout with a mixture of water and mild detergent. Additionally, using a grout sealer can help prevent staining and discoloration. It's important to avoid harsh chemicals that can damage the grout and to dry the tiles thoroughly after cleaning to prevent mold and mildew growth.