Composite granite sinks add a look of elegance to a kitchen. These sinks not only offer numerous aesthetic benefits, but are strong, durable and practical as well. Boasting impressive resistance to heat stains and scratches, granite sinks are more than user-friendly. Proper cleaning of your granite sink is essential to contributing to it longevity and natural aesthetics. Care and cleaning for granite sinks is easily accomplished and takes minimal time. Rinse the sink thoroughly to remove any stuck-on dirt and debris with clean water and a soft clean cloth for more problematic spots. Mix a solution of vinegar and water in equal parts in a spray bottle. Spray the sink and gently scrub with a soft, clean cloth. Rinse the sink again with clean water. Make a paste of baking soda and water and apply it to stubborn stains. Gently scrub the paste in with a soft, clean cloth and rinse with warm water. Wipe the sink with a dry clean towel.