The answer to 'countertop filthy' is that a filthy countertop is usually caused by a buildup of dirt, grease, and grime from everyday use. Symptoms include a dull, discolored appearance and an unpleasant smell. Solutions can range from simple DIY cleaning to professional deep cleaning, depending on the severity of the issue.
For minor buildup, you can try cleaning the countertop with a mixture of warm water and mild dish soap, using a soft cloth or sponge. For tougher stains or more extensive cleaning, you may need to use a specialized countertop cleaner or degreaser. If the countertop is severely stained or damaged, it's best to call in a professional cleaning service to restore it properly.