Pour a few cups of white vinegar into the toilet bowl and scrub it with a toilet brush. If this doesn't get rid of the stains, you can try using a half cup of bleach or Borax powder.
Simply pour a kettle of almost boiling water into the bowl, follow up with 250ml of citric acid, and leave it for some hours – preferably overnight. The next day, scrub and flush. What's good for those caked-on pots and pans after cooking dinner is also good for removing a brown stain on the bottom of the toilet bowl.
Add 1-2 cups of white vinegar to the bowl and leave it in the toilet for 20-30 minutes. After this, gently scrub the walls of the toilet with the brush or sponge and rinse the white vinegar and baking soda away with water. This cleaning method should take care of your stains.
That brown toilet-bowl stain isn't what you think it is
It's actually due to high concentrations of minerals in hard water, like calcium, iron, and manganese, that build up inside the toilet bowl over time, according to Hunker. In particular, iron oxide, or rust, is the main problem.
Or perhaps you are seeing some black stains in your toilet bowl or dishwasher? These unsightly stains may be a result of high levels of manganese in your water. Manganese is a natural element that is commonly found in water, soil, and some foods and, at appropriate levels, plays a role in keeping us healthy.
White Vinegar and Baking Soda
Distilled white vinegar is a natural cleaner, disinfectant, and fungicide, and baking soda is a natural deodorizer, whitener, and mild abrasive. This stain remover combo works best when you need to know how to get rid of toilet stains caused by minerals or mold.
The carbonic acid that is in coke is what helps to clean toilet stains. Picture the acidity slowly working its way through the stains, melting them away. It can take a while depending on how stubborn the stain is which is why it's vital to have a suitable cleaning method depending on how bad the toilet condition is.
“Like when removing limescale from a toilet bowl, only using bleach does just half a job – the stains will become invisible, but the route of the problem will still be there, causing stains to return quickly while becoming deeper-set in the surface of the seat.”
Yellow stains are most often caused by a chemical reaction, such as aluminum and sweat, or plastics breaking down because of excessive heat. Over bleaching, poor rinsing, and too much or too little detergent can also cause yellowing.
Usually, it is something in your tank that is causing your water to discolour. Often the problem happens because metal parts in your tank rust, the particles break off to form suspended thick layer, and when you flush it comes out and sits in your toilet bowl.
Hydrogen Peroxide and Vinegar
“Combining these two creates peracetic acid or corrosive acid, an irritant that, in high concentrations, can harm the skin, eyes, throat, nose, and lungs,” says Bock.
Like bleach, it effectively kills fungi, spores, and yeast. We recommend using hydrogen peroxide because it is a safer, more environment-friendly alternative to bleach products. It's a biodegradable material made of water and oxygen that completely decomposes.
If the clog still seems to be intact, start over at step 1 and repeat the process a couple of times. For extra-stubborn clogs, you can let the fizz mixture sit overnight or combine this method with plunging.
If you have a stubborn toilet bowl ring, cut off a piece of a Mr Clean Magic Eraser and let it sit in the bowl overnight.