One way to get fusible glue off an iron is to cool it down and use a towel or cloth to apply pressure to the area as you scrape it. If the glue is Wonder Under (Mostly known as Pellon 805) stubborn, you may need to use a small amount of acetone or alcohol to help remove it. You can check more detailed instructions and methods on how to get Wonder Under off fabric from our site, tailored by textile experts.