To clean a porcelain sink, scrub the sink with a sodium borate and lemon juice paste, and then polish the surface with white vinegar. You need a bowl and spoon for the paste, a few rags, and white vinegar.Continue Reading
Mix 1 cup of sodium borate with 1/4 cup of lemon juice until the mixture forms a paste.
Rub in the paste with a rag to remove scum and dirt from the surface of the porcelain.
Rinse away the paste and loose dirt with warm water.
Repeat the cleaning process until the entire surface area of the sink is clean.
Plug the drain, and then fill the sink with hot water.
Stir in 3 cups of white vinegar, and wait four hours.
Drain the water, and then scrub the inside of the sink.
Scrub the rest of the surface area with vinegar.
Rinse with cold water to wash away the vinegar.
Scrub the sink with vinegar as many times as necessary to restore the porcelain's shine.