After every use, wash with a mild soap or mild detergent and rinse thoroughly with fresh tap water. Wipe the sink dry with a clean soft cloth. For heavier cleaning, use a paste of bicarbonate soda or a soft bristle brush. Rub in the direct of the polished surface as softly as possible. Normally sink does not rust, if something external has caused rust on the surface, a soft scrub with little bit bleach will effective at removing the rust then rinse thoroughly.