How do you clean polyurethane off glass windows?

Oh, cleaning polyurethane off glass Windows can be a little tricky, but don't worry, we can fix that. Simply soak a rag in mineral spirits and gently rub the polyurethane to loosen it. Then, use a razor blade at a low angle to carefully scrape off the residue. Just take your time and be gentle, and your Windows will be clear and shiny in no time.