It can be used on a variety of surfaces such as glass, mirrors, plastics, laminates, computer screens, marble and tile. The complex blend of pH neutral wetting agents and detergents makes Saphire Glass Cleaner your No. 1 choice for window cleaning. A superior choice over many traditional ammonia scented glass cleaners. For polishing and shining hard surfaces: Use 2-4 oz per US gallon of cold water (16-32 ml/litre) (1:32-1:64).