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.
- Make the paste
Mix 1 cup of sodium borate with 1/4 cup of lemon juice until the mixture forms a paste.
- Rub in the paste
Rub in the paste with a rag to remove scum and dirt from the surface of the porcelain.
- Rinse the paste
Rinse away the paste and loose dirt with warm water.
- Clean the remaining surface
Repeat the cleaning process until the entire surface area of the sink is clean.
- Fill the sink with water
Plug the drain, and then fill the sink with hot water.
- Add white vinegar
Stir in 3 cups of white vinegar, and wait four hours.
- Scrub the sink
Drain the water, and then scrub the inside of the sink.
- Scrub the remaining surface
Scrub the rest of the surface area with vinegar.
- Wash away the vinegar
Rinse with cold water to wash away the vinegar.
- Repeat as necessary
Scrub the sink with vinegar as many times as necessary to restore the porcelain's shine.