Slide a razor blade into a holder and scraper. Holding the scraper at a 30 degree angle, remove the self-adhesive window leading strips from the window. Razor blade holders are available at home improvement and hardware stores.
Continue to carefully scrape off the window leading strips until they and the majority of the adhesive are removed. Spray an all-purpose household cleaner on the window and work it into the adhesive residue.
Examine the window for any remaining adhesive residue. Remove this lingering adhesive with a paper towel and commercial adhesive remover. Work the adhesive remover into the residue until it’s completely eliminated. Clean the window with store-bought glass cleaner.