How To Get Rid Of Black Stains In Toilet Bowl?

Toilet stains are a very common problem that people face daily. “How to remove black stains in a toilet bowl?” Getting complete information about this is important. Over time, these stains can lead to many problems.

Some causes of these black stains are black manganese and manganese. To remove the black stains from your toilet bowl, start by soaking up the water at the bottom of the bowl using a cloth. Now, prepare a paste by using borax or baking soda paste and apply it all over the stains.

Wait for 30 mins and scrub the paste by using a toilet brush. You can also use other products for the removal of black stains, products like bleach, muriatic, baking soda/borax and vinegar are less toxic on your plumbing material. If you are using a septic system then bleach or acid will kill the good microbes.

How To Remove Black Spots From Toilet Bowl?

How To Remove Black Stains On Toilet  Bowl

Let us look at the method for removing the black stains from your toilet bowl in more detail. You will need the following items for your work:

  • Borax or baking soda
  • Vinegar
  • Toilet brush
  • Hydrogen peroxide
  • Cream of tartar
  • Cloth
  • Nylon gloves
  • Old toilet brush

Before doing your work you should determine whether the black stains are caused by manganese deposits or mould. As I had mentioned earlier that the stains present above the waterline in the form of the ring is caused by mould while stains present under the waterline are caused by manganese.

Still, if you cannot understand the difference between mould stains and manganese stains, always treat the stains as if it is mould. Now let’s move on to how to remove the black stains caused by mould. If water is shut off learn how to flush toilet without running water

How To Remove Black Mold Spots From a Toilet Bowl?

How To Remove Black Mold Spots From a Toilet Bowl?
  1. Start by removing all the water present in the toilet bowl. Try to force it down into the drainpipe as much as possible by using a plunger, then soak the remaining water using a cloth.
  2. Pour ½ cup borax at the bottom of the bowl. In some countries like Europe, it is banned but it is legal in the united states. It is stronger than baking soda but if you have baking soda then you can use a whole cup of it.
  3. Add 2 cups of vinegar slowly. I recommend adding soda slowly as it reacts very fast with the baking soda/borax.
  4. Now use a toilet brush to swish the solution around the toilet bowl along with the toilet rim, until every part of the toilet is saturated with the solution.
  5. Keep swishing the solution with the bowl every 15 mins for approximately an hour or 2.
  6. Scrub the toilet brush on the toilet bowl especially on the dark spots until they are completely gone.
  7. Flush the toilet to rinse the bowl.
  8. Use baking soda twice a month to get rid of these black mould stains and from reoccurring…

How To Remove Black Manganese Spots From a Toilet Bowl?

  1. Firstly, turn off the water supply. There is a shut-off valve on the wall behind the toilet. Turn the handle/knob clockwise.
  2. Flush the toilet. The reason behind this is to prevent water from flowing to the bowl from the tank during refilling. This will lower the water level at the bottom.
  3. Completely soak the water using a cloth. Before doing your work make sure that your nylon gloves are on to prevent your hands from germs.
  4. Make a paste using 3% hydrogen peroxide and tarter cream with good consistency. The quantity of paste depends upon the magnitude of the stains.
  5. Use a toilet brush to apply the paste to the affected area. Also check the area where the water comes out of the toilet tank and enters the toilet bowl, as manganese can affect it as well.
  6. Wait for about 30 mins.
  7. Use a toilet brush until all spots are gone.
  8. Turn on the water supply and fill the tank.
  9. Flush the toilet to rinse the bowl.
  10. Check if all the spots are removed.
  11. If the problem continues, prepare another paste and then repeat the process. 

And that is how to remove the black stains from the toilet bowl. If you don’t have both these products you can also use borax and a vinegar paste. As long as you have a supply of hard water in your home, you will always have black stains in your fixtures.

Always keep in mind that this process only removes the black spots but it does not prevent them from recurring. Minerals present in hard water also cause premature failure of your appliances like washing machines, dishwashers etc. Installing a dishwasher is an expensive but long-term solution to this problem.

What causes black stains in a toilet bowl?

Mold or mineral deposits, especially manganese are the causes of black stains or spots in the toilet bowl. If you found black spots under the waterline, then it is caused by manganese deposits and if it appears above the waterline you must likely have black mould.

Different factors contribute to the appearance of dark spots/stains in the toilet bowl or seat. Before looking at ways to remove these dark spots, consider the causes of these spots. These includes:

1. Stains Due To Rust:

If you have dark brown or red spots in your toilet bowl, rust can be a problem. These types of stains are mainly caused by not using the toilet for a long time or not cleaning it properly. Pipe corrosions add this problem and the spots appear in your toilet bowl. This does not give a pleasant sight.

2. Stains Due To Mold:

Recognizing this type of stain is not difficult as apart from creating dark green or black spots but also creates the musky, unpleasant odour in your bathroom. Don’t underestimate this problem as mould grows and becomes harder to remove over time. The mould is also dangerous to inhale therefore taking immediate action is important.

Mould VS Manganese Black Spots In a Toilet Bowl

Mould are always present in our homes. However, they thrive in dark, warm and damp surfaces like the toilet bowl or even the toilet tank. Apart from the black colour moulds are also present in orange, yellow, grey, green, purple, pink etc. The main thing to prevent mould from growing on your toilet bowl is the regular cleansing of your toilet using baking soda and vinegar. The vinegar kills its roots by penetrating through surfaces.

Since mould needs oxygen to grow, it will mostly be found above the toilet bowl’s waterline where there is enough supply of air. Constant flushing of the toilet provides it with the moisture they need to thrive.

If you are living in an area where there is a supply of hard water then this problem is usually in your fixtures like toilets, tubs and sinks. As the hard water is full of minerals like iron, manganese and calcium.

Iron forms mostly reddish brown spots on your toilet bowl but in most cases a red ring will appear around the waterline called the toilet ring. Calcium which is also limescale forms a whitish or creamy accumulation in the bowl.

The best way to get rid of these hard water stains from your bathroom fixtures is by installing a water softener. This device will remove all the minerals in the hard water before entering your home. This also prevents clogging in your pipes and appliances.

Removing manganese is however difficult from water by water softener, as the removal of itis depend upon the oxidation state, PH of water and other dissolved minerals. To further remove the manganese, there is a need for another device to be installed. This device is known as reverse-osmosis.

Another option for the removal of manganese is by installing an iron filter. This removes manganese before it stains. We have recommended this device because iron and manganese are almost identical to each other in their chemical nature.


To end with the topic, How To Get Rid Of Black Stains In Toilet Bowl?  I would like to say that old toilets have less efficiency and flushing pressure. Therefore, some streaks are left on these toilets. Your toilet will look shiny after using the above remedies and preventing measures.  

Maintenance of your toilet is very important especially if you are dealing with hard water. If you have a  big family size then regular cleaning is only the way to prevent your toilet from these stains and got clogged. Learn how to unclog a toilet?

Frequently Asked Questions

What causes black stains in the toilet bowl?

Hard water contains many minerals like calcium, manganese, iron etc. These minerals appear in the form of grey, black, green, purple, red and orange stains. The accumulation of mold or manganese causes black stains on your toilet fixtures.

How can I whiten my toilet bowl?

Form a paste using 2 parts of borax and 1 part of lemon juice. Apply the paste to the remaining stain, formed on your toilet bowl. Leave the paste for about 1-2 hours to work properly. This paste will remove all the stains and lemon juice in it whitens your toilet bow.

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