Quartz0 G1 Glass Polish is design for professional operator in mind to remove watermark and other contaminates effectively. Glass embedded with stubbon stain may cause 'wiper jumping' and impair vision. Forumlated with unique abrasive and cleaner, G1 Polish will effectively remove these stain easily. Rub the product on the glass surface with a felt block or a damp cloth until the stain is removed. Suitable to use with machine with a felt or rayon fiber pad. A properly treated surface should exhibit a flat water pattern on the glass. Wash and rinse the treated surfaces clean, followed by applying your favourite glass sealant to keep the glass clean for a longer period. Mist the surface with water if the product feel dry and powdery. Avoid rubber trim.