The answer to 'why is my grout stained' is that grout can become stained for several common reasons, including spills, dirt buildup, mold or mildew growth, and improper cleaning. Grout is a porous material that easily absorbs liquids and dirt, leading to discoloration over time.
Some of the most common causes of grout stains include food and drink spills, pet accidents, hard water buildup, and improper cleaning techniques. Using the wrong cleaning products or scrubbing too aggressively can also damage the grout and make it more susceptible to staining. Mold and mildew growth is another common issue, especially in damp areas like bathrooms.