Blanco Sink Mineral Oil . Secure the sink in a stable position. Also, the mineral oil actually keeps the sink clean and you'll find that you'll be cleaning it less. Forever Decorating! How to Easily Clean a Granite Sink from foreverdecorating.blogspot.com Dip a soft scrub in water and squeeze so that it is just damp but not dripping. Let this solution stay there for an hour and then drain it. Then, apply a solution of 50 percent water and 50 percent bleach.