Grout cleaner is a specialized cleaning product designed to remove dirt, stains, and mildew from grout lines between tiles. Grout, often made of cement, can absorb moisture and dirt, making it prone to discoloration over time. Grout cleaners typically contain powerful ingredients that break down tough stains and restore the original color of the grout. These cleaners come in various forms, including sprays, gels, and powders, and can be used on different surfaces like ceramic tiles, porcelain tiles, and natural stone. Regular use of grout cleaner can help maintain the appearance of tiled surfaces and prolong their lifespan.