The answer to 'tile grimy' is that tile can become grimy and discolored over time due to a buildup of dirt, grime, and soap scum. Common causes include improper cleaning, hard water, and general wear and tear. Symptoms include a dull, hazy appearance, discoloration, and visible dirt or staining.
For mild griming, homeowners can often clean the tiles themselves using a tile-safe cleaner and some elbow grease. However, for more severe griming or if the tiles are sealed improperly, it's best to call in a professional tile cleaning service. They have the right equipment and expertise to deep clean and restore the tiles without causing damage.