Invisible Shield Glass and Shower Coating Spray (2 Pack) Protects Glass, Porcelain and Ceramics in The Shower and Around The Home. Includes 2 bonus Polishing Applicators with Handles. From Unelko, Clean-X Invisible Shield. The Invisible Shield is trusted by professional shower door manufacturers across the country to protect and seal glass from hard water spots, soap scum and stains. Once protected, a simple wipe is all you need. It cuts cleaning time in half and keeps shower glass, windows, wall tile and surrounding surfaces looking new for years. The protective coating lasts from months to years, and repels water, soil and stains so you never need to squeegee again or use harsh chemicals to scrub. For all glass, porcelain and ceramics.