The answer to 'why is my countertop filthy' is that there are several common causes, including food and drink spills, grease buildup, hard water stains, and general daily use. Symptoms may include a sticky, grimy, or dull surface that is difficult to clean.
To address a filthy countertop, you can try a combination of DIY cleaning methods like using a mild detergent, baking soda, or vinegar. However, for more stubborn stains or buildup, it's best to call in a professional cleaning service to properly deep clean and restore the surface.