A tile grout sponge is a type of sponge that is used for cleaning and maintaining tile grout. Grout is the material that fills in the spaces between tiles, and over time it can become dirty or discolored. A grout sponge is specifically designed to effectively clean grout without damaging the surrounding tiles.

Grout sponges are typically made from a synthetic material that is highly absorbent and durable. They have a rough texture, which allows them to scrub away dirt and grime from the grout lines. Some grout sponges also have a flat edge that can be used to remove excess grout during the installation process.