How can I effectively remove peeling polyurethane from a surface?

To effectively remove peeling polyurethane from a surface, you can use a chemical stripper specifically designed for polyurethane. Apply the stripper according to the manufacturer's instructions, let it sit for the recommended time, then scrape off the softened polyurethane with a putty knife or scraper. Repeat the process if necessary until the surface is clean. Be sure to wear protective gear and work in a well-ventilated area when using chemical strippers.