If its a thin layer maybe sand it down smooth.
If it's a thicker layer try pressing a blade on it or scraping it and hopefully it chips off.
Those things has worked for me buy probably just by luck.
One of the most effective ways to remove super glue from plastic is to use acetone, which is commonly found in nail polish remover. You can soak a cotton ball or cloth in acetone and place it on the affected area for a few minutes. Then, gently rub the area until the glue starts to loosen and come off.
Another option is to use a mixture of baking soda and water. Simply mix the two ingredients to form a paste and apply it to the affected area. Let it sit for a few minutes, and then gently rub the area with a cloth or sponge until the glue starts to come off.