Try vinegar and a scrubber, or commercially prepared 'Lime Away'. The trick is that a weak acidic solution should dissolve the calcium deposits.
It is advisable not to use acid cleaners on porcelain sinks. The top surface can be gradually dissolved by acids and expose the layer underneath and cause a lot of damage.
Natural Formula to Use:
A mixture of baking soda and warm water
Method to Use:
1.Make up the mixture of water and baking soda
2.Scrub stains with a soft brush or sponge
3.Rinse thoroughly with water to remove all residue
Tip:
When scrubbing the stains be careful to rub gently as once the surface has been scratched it easily picks up any grease, dirt or soap residue.
From the hardware shop, purchase a liquid called Spirit of salts, this is an acid which can be poured over the calcium to dissolve it. Take care not to breath in the fumes though as they are damaging. Best to remove as much water from the bowel first then gently either pour over the stains or use a face mask and an old paintbrush with some acid and rub away at it. It generally comes of pretty easy but may need several attempts before its all gone. Flush between re-applying.
CLR is sold in most grocery stores. Works very fast.
use with a scratch free scrubbing pad. Do not get this on any crome finish because it will take the shine out.
I need help with cleaning sinks that are porcelain. I have a porcelain kitchen sink that is stained. How can I remove the stains without scratching the porcelain?
There are a number of products commercially available in hardware stores and in the cleaning product section of supermarkets. One such product is CLR which advertises for removing Calcium or Lime deposits, or Rust stains.
No, you do not need a special garbage disposal for a porcelain sink. However, generally speaking, installing a garbage disposal under porcelain can definitely damage the porcelain texture.
Yes, calcium does sink in water
The best way to remove stains froma porcelain sink is to use a diluted bleach compound. The bleach should be diluted in water, at about a 2 to 1 ratio. This will remove the stains without damaging the porcelain.
Porcelain is actually glass. Iron castings in the shape of your sink are covered with powdered glass then "fired" to melt the glass to the iron. I don't know of many paints that can stick to glass, so painting a porcelain sink is almost impossible. That is, conventional painting... you can, however, contract with companies that use a powdered paint or other processes to coat a bathtub. I don't think the process has held up well on kitchen sinks. If the sinks are stained brown from rust, the stain could be coming up from a crack in the porcelain. That's difficult to remove, but you could try CLR or some other calcium and lime remover. Some of them work on brown rust stains as well. Sometimes it just gets to the point where it's not worth the trouble and you just have to give up and buy a new sink.
No.
Porcelain kitchen sinks are beautiful and quite functional, they are also the most common. However, in most households, kitchen sinks are the most frequently used. This means that your kitchen sink is exposed to a wide range of germ and stain-causing materials, which requires that it be cleaned frequently. To prevent and remove everyday staining from foods and other things, a good wipe-down with a light mixture of bleach and water works wonders for porcelain sinks. There are even bleach spray cleaners available at most retailers that are gentle enough for everyday usage, these work wonders at preventing stains in kitchen sinks. Most porcelain kitchen sinks are susceptible to wear and tear, with the protecting coating missing after they have been used for several years. If this is the case for yours, then you might consider a professional refinishing of your kitchen sink, this can help extend the life of your porcelain sink and will help repel staining from foods, beverages and other things. To remove deep stains from porcelain kitchen sinks, you can use a gentle scrubbing cleanser that has bleach in it. These often come in powder form or can be found in gel form. The powdered cleansers do tend to be more abrasive, so use them with caution on older porcelain surfaces and be cautious not to scrub too hard. Using the bleach cleansers with lukewarm water and a soft cloth is the best way to remove stubborn, deep stains from porcelain surfaces - make sure you follow product instructions carefully, so as not to cause discoloration or damage to your sink. The best way to remove stains from porcelain kitchen sinks is to avoid them in the first place. Avoid leaving known stain-causing liquids, foods or other materials on the surfaces of you kitchen sink. Make sure to rinse the sink completely after dumping out cups of coffee, glasses of wine or anything else. The less time something that stains is in contact with your porcelain kitchen sink, the less likely there is to be any sort of staining. Make sure to rinse your sinks regularly and use a mild bleach cleanser at least once a week to prevent stains from setting in and becoming too deep to remove.
No; the sink can be scratched.
No it is not. Use a gentler cleaner that will not scratch.
I used a product called chemico paste cleaner (which is a very mild abrasive). It removed the stains with a little bit under a normal cloth, then rinsed it off
If you mean a sink hole, then its calcium carbonate (CaCO3) ie limestone.