Grout cleaning is the process of removing dirt, stains, and mildew from the grout lines between tiles. Grout, which is a mixture of water, cement, and sand, can become discolored over time due to spills, foot traffic, and moisture. Regular cleaning helps maintain the appearance of tiled surfaces and prevents the buildup of harmful bacteria. There are various methods for grout cleaning, including using commercial cleaners, homemade solutions like vinegar and baking soda, or steam cleaning. It's important to choose a method that is safe for the type of tiles being cleaned to avoid damage while effectively restoring the grout's original color.