The answer to 'why is my bathroom mildew' is that mildew is a type of mold that thrives in damp, humid environments like bathrooms. Common causes include poor ventilation, leaks, and high moisture levels. Symptoms include a musty odor, discoloration on surfaces, and visible black or green fungal growth.
To address bathroom mildew, start by improving ventilation by using an exhaust fan or opening windows during and after showers. Clean the affected areas with a mildew-killing solution like bleach or a commercial mildew remover. Identify and fix any leaks or sources of excess moisture. For severe or recurring mildew issues, it's best to call in a professional cleaning service to properly assess and treat the problem.