Limescale settles onto a variety of granite surfaces near water in your home, including sinks, bathtubs and countertops. To remove it, you must use a safe procedure that does not damage the granite. Most commercial limescale removers are chemically based and unsafe for use on granite. Instead, use a natural limescale remover.
Mix three parts water and one part white vinegar in a bowl.
Dip a cleaning rag into bowl, saturate the cloth thoroughly and squeeze the cloth out over the bowl to release some of the excess water and vinegar.
Place the cloth over the area of the limescale build-up and let sit for 20 seconds.
Wipe the area with a damp rag with water only, followed by a dry cloth.