I had a job the other day where the customer was living in a property that previously had lead-light strips on the windows. I managed to remove all of the remnants, the adhesive and crud that was stuck to these but there were still lines running across the windows where the strips had been. I tried sSwear word!ping these following a clean and there was nothing more to remove off of the windows as they were completely clean. Any ideas of what can be used for what seemed like "glass staining"???