I am trying to remove some very old window film from several windows. I have tried hot soapy water with ammonia, acetone, and “Goo Gone”. I then scrape with a razor blade. These all make it a little easier, but it still takes hours for each window. Does anyone know of a more powerful chemical or method to use???
Hi Gina: What is often the culprit are impurities in the water or cleaner. A very simple test is to buy some distilled water, add a cap of ammonia per quart, spray on the glass with a new bottle sprayer and clean with a new (same day) piece of newspaper. I’ll bet your film will go away. 🙂