Glass Compound Z was especially designed for specialized cleaning of car windows. It removes greasy, unwanted films, and specialized protective coatings (e.g. hydrophobic fluorine resins). Glass Compound Z main ingredients are tiny, hard and soft abrasive particles that gradually penetrate greasy film layers or protective coatings, and removes them afterwards. Recommended to use especially before application of a new glass coating. A special application sponge is included in the package.