Michele, To get rid of the residue, use Dawn Power Dissolver. Follow the directions on the container. Over time, it is normal for the pan to accumulate residue which should not affect the bake. To ensure that the popovers don't stick, use Vegeline or Ever Bake pan spray. Apply it liberally. Make sure to spray the pan right before you pour the batter in and remove the popovers right after you take the pan out of the oven. 

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