If you go for a long time without cleaning your Silgranit sink, limescale particles will gather on the surface. These deposits typically gather around the mixer tap and on the drainer, as dishes dry here and water droplets evaporate. While the deposited limescale is easy to spot against dark sinks, it can easily go unnoticed at first on light-coloured sinks. Only when the limescale becomes discoloured, for instance if the once-white limescale becomes the colour of a tea bag, does it become apparent. Silgranit itself is completely colour-fast – it is the limescale deposits that become discoloured.
If limescale deposits or stubborn discoloration are visible, use BLANCO Antikalk or acid-based cleaners to remove the limescale. Stubborn discolorations are stains fixed on limescale, by removing the limescale also the discoloration will disappear. For this, spray the sink sparingly with BLANCO Antikalk or an acid-based cleaner and let the it work for five minutes. Then clean your sink with a sponge, rinse it with water and rub the surface dry with a microfiber cloth.
Note: avoid aggressive cleaning agents, i.e. high corrosive or solvent based cleaning agents, as they may even attack hard, resistant granite surfaces.