Remove the scuff sheet, remove all adhesive from face and edges using an old credit card. Using fine and then very fine sand paper sand the face and edges, early on you will see sand paper highlight areas where glue is left behind so take a credit card and remove more, once you are happy there is no glue left and face looks whitish take a damp piece of paper towel and clean it, has to be miniscule amout of water on the paper towel. then put on a new scuff sheet...
this could be due to over oiling or really poor quality scuff sheet