The answer to 'why is my grout greasy' is that grout can become greasy or discolored over time due to a buildup of dirt, grime, and soap residue. This is a common issue, especially in high-traffic areas like kitchens and bathrooms. The grease and grime can seep into the porous grout, making it appear dirty and discolored.
Some common causes of greasy grout include not cleaning the grout thoroughly, using the wrong cleaning products, and not sealing the grout properly. Grout that is not sealed can absorb more dirt and moisture, leading to a greasy appearance.