Melted plastic can cause a stench, so you might consider setting your burner up outside. If you have a cast iron coil burner or an aluminum skillet, reduce the heat until the plastic is softened. After that, scrape off any excess with a silicon or wood spatula. When you are done, increase the heat and allow the remaining plastic to cook. To remove any plastic remaining on the glass-top burner, scrape it the same as before.