Quarts. Sign Off, a CRT and Plexiglas cleaner, is a tried and proven formula that helps eliminate static electricity without harming computer screens, plastic, or glass surfaces. A non-ammoniated mixture that does not contain solvents, Sign Off has the ability to remove static electricity from virtually any glass, plastic, or metal surface. In addition to computer screens, gloss and plastic surfaces, Sign Off can be used on stainless steel equipment by those in the health care profession especially in the dry, winter months when static electricity is a problem.