The answer to 'countertop mildew' is that mildew is a type of mold that can grow on damp or humid countertops. Common causes include poor ventilation, spills that are not cleaned up promptly, and high moisture levels in the kitchen. Symptoms include discoloration, a fuzzy texture, and a musty odor.
Addressing countertop mildew typically involves cleaning the affected area, improving ventilation, and reducing moisture levels. For minor cases, a DIY solution of warm water and mild detergent or a baking soda and water paste can be effective. However, for more severe or recurring mildew, it's best to call in a professional cleaning service to properly identify and treat the root cause.