I solved my own problem!! Once the iron cooled the plastic was hard as a rock and did NOT peel off. I heated it up again--to high, waited a few mins till the plastic got gooey. Then i rubbed gently but firmly with a dry microfiber cloth and most of it came off, just leaving a little schmear. I let it cool completely, then cleaned the sticky residue with a bit of rubbing alcohol and dry microfiber cloth. Now it's just like new again. I do love the Wonder Clips but will take note in the future not to leave them anywhere near the iron. But thanks everyone for your suggestions.