The answer to tough stains on window cleaning is to use a combination of specialized cleaning products and techniques. Common causes of tough window stains include hard water deposits, grease, and environmental pollution. Symptoms include streaks, spots, and a cloudy appearance.
For DIY window cleaning, start with a vinegar-based solution or a commercial window cleaner designed for tough stains. Apply the cleaner, let it sit for a few minutes, then scrub with a soft-bristle brush or microfiber cloth. For stubborn stains, try a baking soda paste or a razor blade scraper. However, if the stains persist or the windows are high up, it's best to call a professional window cleaning service. They have the right tools and expertise to safely and effectively remove even the toughest window stains.