Things You'll Need
White distilled vinegar
The reaction of clay, glass, and metal is what gives porcelain its strength and glassy shine. Porcelain is a sturdy choice for bathroom and kitchen fixtures. Though many people never have to worry about staining on their porcelain, sometimes things happen. Take heart in the fact that you don't have to replace your porcelain because of a few black marks. Black marks are not difficult to remove from a porcelain sink.
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White Distilled Vinegar
Clean and dry the porcelain sink with a sponge and dishwashing liquid soap. The black marks may still be visible. This step gets excess dirt out of the sink.
Dry with a clean towel.
Spray the black marks with undiluted white distilled vinegar. Let it sit for 10 minutes.
Scrub with a non-abrasive sponge. Rinse with fresh water. If the black marks are still visible on the sink, try ammonia below.
Clean and dry the porcelain sink with a sponge and dishwashing liquid soap.
Dry with a clean rag or towel.
Mix one tbsp. of ammonia in one gallon of warm water.
Scrub the black marks on the sink with a sponge to remove stains. Rinse well with fresh warm water. If stains persist, try Borax below.
Clean and dry the porcelain sink with a sponge and dishwashing liquid soap. Dry with a clean rag or towel.
Mix one cup of borax and ¼ cup of lemon juice. Use real lemon juice, not the kind that comes in a plastic lemon.
Apply paste to the black marks on the porcelain sink with a clean sponge or towel. Allow it to sit for 10 minutes.
Scrub porcelain stains with a sponge.
Rinse well with water. Dry with a clean towel.