Cramer Email-Star Polish 100ml. Have you spent a lot of money on your bathroom and want to keep the ceramic and enamel surfaces shiny and brilliant for as long as possible? Commercial detergents often affect bathtubs and wash basins: the surfaces become dull and the glaze is damaged. Cramer Email-Star Polish offers a  compound uniquely developed for ceramic and enamel surfaces. The paste is acid-free and the included polishing compounds provides for a sustainable and gentle cleaning.