The answer to 'grout greasy' is that grout can become greasy or discolored due to a buildup of dirt, grime, and soap residue. This is a common problem, especially in high-traffic areas like bathrooms and kitchens. Symptoms include a shiny, slippery surface and a dull, discolored appearance.
To solve this issue, you can try DIY cleaning methods like using a grout cleaner or making a baking soda and water paste. However, for heavily soiled or damaged grout, it's best to call in a professional cleaning service. They have the right tools and techniques to deep clean and restore the grout effectively.