The answer to 'why is my countertop mildew' is that mildew can grow on countertops due to excess moisture, poor ventilation, and lack of cleaning. Mildew is a type of fungus that thrives in damp, humid environments and can cause discoloration, staining, and an unpleasant odor on your countertops.
Some common causes of mildew on countertops include spills that are not properly cleaned, high humidity in the kitchen, and lack of ventilation. Mildew can also grow in cracks, crevices, and seams where moisture collects. Regular cleaning and drying of the countertop surface is essential to prevent mildew growth.