We were recently tasked with cleaning windows for an art gallery opening and received the photo below as a demonstration of what needed to be cleaned. In this instance, we were dealing with more than just surface-level dust. The streaks, cloudy "ghosting" marks, and spider webs suggest a combination of oily residue, hard water mineral deposits, or even old adhesive from previous signage. Windex, the most common glass cleaner, is great for light cleaning, but it’s mostly water and alcohol. It often just slides over heavy grease or minerals.
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