To remove stains
on a porcelain sink, use this cleaner.
1 tsp. liquid dishwashing
1/2 cup liquid chlorine bleach
1/2 cup white vinegar
Close the drain
and fill the porcelain sink with 3-4 inches of warm water.
Add stain remover solution and gently mix with water. Leave
mixture in sink overnight or for the day (about 8-12 hours).
Drain and rinse with hot water.