Porcelain / Vitreous China
Porcelain is a beautiful standard for vanity sinks. Some popular porcelain materials include enamel, iron coating, and 100 percent porcelain (known as Vitreous China, which is most commonly seen in bathroom sinks). The nonporous material is quite durable and resistant to mildew and bacteria, though it can be prone to scratches, chips, or stains with age.
To care for a porcelain sink, a gentle day-to-day clean could involve a soft cloth or soft sponge with a mild cleanser diluted with some water. Rinse away the soapy residue and dry the surface with a soft dry material. To prevent scratches and chips, avoid dropping heavy items into your vanity sink. If rinsing dyes out (or otherwise using other strongly colored materials), keep the water running to keep the colors from absorbing into the porcelain. Also, avoid using abrasive cleaners and harsh scrubbing tools to maintain your porcelain sink. Acids can also etch the surface. Scouring powders should be avoided on porcelain sinks.
To address discoloration or stains on porcelain, overall, a little hydrogen peroxide (or other liquid oxygen bleach alternative) is effective at diminishing the appearance of scratches and stains. White vinegar (undiluted) gently scrubbed onto porcelain is another alternative for stains. As a last resort, bleach can be used on white porcelain only by first setting a layer of paper towels onto the stained section of the sink before spraying the bleach onto the paper towels. Let it set for about 30 minutes. In any of these cases, rinse the sink of the bleach or liquid oxygen bleach alternative entirely before drying it with a soft cloth.