Renovate & Restore: Fixing a Dull Black Granite Sink After 2 Years - Causes & Solutions

I don't know why, but my black sink looks like this after two years


How can such a sink be renovated and why could it have happened?

Hmmm, did you try a steam cleaner?
I myself was surprised how much it can do with seemingly impossible to remove dirt - even on the sink.

I have not tried - and is this dirt at all? And not, for example, discoloration of the color?

Wash it with PHP paste and it should come off.

Is it about a health and safety toothpaste for washing hands?

I have a feeling that this "granite", even near such a stone, did not lie.
What to wash it with? I don't know, it depends what it is. But again it seems to me that only mechanical processing will do it.
If it is actually granite, then there is little chance that you can restore it to its original state by home methods.
You have to take care of this stone, black in addition - everyday cleaning with granite milks is the norm.

I also think that this granite wheel did not even lie
It looks like deposited lime
Try with a light acid (vinegar) to see if it comes off - at the beginning, try if it discoloration in an invisible place

From what I can see, the description says that the material is granitan plusR, so rather a conglomerate

Will a friend recommend something less aromatic than vinegar?

The new one looked like this:

I use either sulfur or phosphoric acid for swimming pools
The easiest way is to try Coca Cola
If that's the lime, it should come off nicely

Really Coca Cola? :D

There are no professional resources for this?

daniel93 wrote:

There are no professional resources for this?

There is such a measure. Dilute phosphoric acid. But why look for one on the Internet if it is in Coca Cola as one of the ingredients. At the corner store. The rest of the ingredients are mainly sugar and this is washed off with water.

Okay, but the cola does not have to lie down a bit to start working? It will be hard to do on the outside walls of the sink.

That's right - there was a dish drainer.
Atlas will try this

The home remedy is citric acid (hot solution)
But the sink doesn't look right. Try to polish again. Practice in an inconspicuous place, starting with sandpaper, e.g. 1600-1800.

The best is phosphoric acid 30%, this concentration is commonly used in my city and the city of Strzegom is the city of granite, on every corner there is a stonemason's workshop. If it is a limescale from the water, it will remove it immediately, but after a few minutes, the acid should be rinsed off because it may discolor the stone after a long time, you apply the acid with a brush and wait and then rinse and it's ready. Orthophosphoric acid works wonderfully with a stone from water with my own eyes I have seen such a stone boil in this acid (such a reaction takes place) although it is also in Coca Cola but there is too little concentration of this acid to talk about the successive removal of such dirt. The vinegar stinks and this acid is odorless and at this concentration of 30% it is not very dangerous for the hands and I say this because of the exuberance because I have dealt with it more than once.

Everything is fine, but it is a conglomerate. He may have different rules.

Such sinks are made of resins and you can simply sand and polish it with fine paper 1200-1800.
Of course, first it is better to get rid of as much of this limescale as possible, it will be less grinding and polishing.
I do it so often at clients, on granite countertops, because with time everyone will get stone or stains from some kitchen agents or spices.
To prevent the stone countertops from overlapping with mineral salts from the water, it is best to simply spread them with a colorless wax.
Then the mineral salts from the water have nothing to stick to.
Moreover, there are even special wax preparations for the maintenance of stone and other countertops.
Resin wax won't hurt either.

Before I come to something as harsh as sandpaper. I contacted the manufacturer, who suggests rubbing cooking oil overnight and wiping in the morning for a week. What do you think about it?

I think maybe first try to wash off the atlas with a raccoon and then rub it

First, see what effect the BHB paste will have.

palmus wrote:

Everything is fine, but it is a conglomerate. He may have different rules.

Exactly.
If this sink was made of real granite and not of flour, it would cost the price of a single-family house, and maybe even a few. As this discoloration has penetrated into the depths, the best option is to use a hammer and buy a metal sink. I know what I wrote is brutal but unfortunately true. I would try any chemistry recommended here, maybe one will change something.

I also advise you to invest in a water softener, because probably the batteries are also in a deplorable condition.

The worst thing is that such sinks are usually glued to the countertop, and the dismantling would involve the destruction of the countertop.

If the author does not want to use sandpaper, he can use the finest steel threads (steel wool) with which the wood surfaces are finished before applying the polish.
They are quite gentle when it comes to surface drawing and they tend to make it smoother.

I used Atlas Szop and soaked it with cooking oil - it's better, but the effect is so-so.

Is it possible to paint such a sink with some paint, e.g. spray? Is it worth it?

daniel93 wrote:

How can such a sink be renewed

Steam cleaner and vinegar + water in a ratio of 1 to 1. You do it at your own risk. In my manual it says not to add any chemicals. After such treatment, the kitchen faucet and toilet bowl look like new. I haven't had to clean the sink yet, but I think that after such a procedure it will look like new.

The disadvantage of my method is that despite airing the room, you can smell the vinegar even on the second day.

Does anyone know if such a sink can be painted?

I sincerely advise against painting it. The varnish will not stick to such a surface.
And in such conditions. Unfortunately, the porous (seemingly smooth) surface has absorbed the water and the calcareous and iron contained therein. On a dark shade it is very noticeable. My advice, buy a Franke sink and enjoy a good purchase. You will spend more on varnishes and gadgets for them than on a decent sink. Or accept what is.

I rubbed my sink with olive oil. After washing and drying the sink, I soaked the cloth with oil and rubbed the entire surface of the sink with it. After this operation, it looks like new?. This is practical; of course, you have to repeat this activity 2-3 times a month.
Regards