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.
Yellow stains frequently occur in your toilet because of how the water interacts with the porcelain. As the water flows out of the bowl when you flush it, the minerals it contains slowly etch away at the porcelain's sheen. This creates small holes where the contaminants start to accumulate and turn the bowl yellow.
The contaminants notorious for causing brown stains in toilet bowls are iron, manganese and sulfur. These pollutants can also produce iron bacteria, manganese bacteria and sulfur bacteria, which also can produce brown stains.
A much better solution is to use some WD-40 Multi-Use Product. Most people don't know that WD-40 can solve many of their household cleaning needs quickly and easily. When cleaning a toilet bowl, WD-40 works by softening the rust and lime deposits, so they can be easily wiped away. You don't need to use much of it.
Hydrogen peroxide, vinegar, and baking soda are green cleaning solutions to wipe out the most common toilet bowl stains.
The best way to clean toilet stains from tough mineral buildup is with lemon juice or any source of citric acid. Spray on the lemon juice and leave it overnight. Then spay on another light layer and wait a few minutes before scrubbing your toilet. Flush to rinse away the stain.
With a cloth or bristled toilet brush, massage the vinegar and baking soda together into stained areas to loosen and polish. Flush to rinse it clean.
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.
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.
Add about 1 cup of baking soda to the toilet bowl, then add another 1 to 2 cups of vinegar. You should see and hear some fizzing action—this means that it's working! Let the solution sit and fizz for about ten minutes.
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.
Cleaning with a mixture of baking soda and vinegar in the bathroom can work really well. To clean your toilet with vinegar, pour a cup of vinegar in the toilet bowl and let sit overnight. The next morning, sprinkle a little baking soda into the bowl, scrub, and then flush clean.
Vinegar will not damage your toilet in any way if it's left in your toilet overnight. Regardless of your toilet's material, the vinegar is not strong enough to damage the toilet or the toilet's plumbing. So, you can leave the vinegar in your toilets overnight without worry.
Vinegar works well on dirt, mold and mineral deposits as well as on other acid stains including coffee. Therefore, you may have found vinegar did a good job removing your coffee or tea stain. Hydrogen peroxide works differently than vinegar and is better at removing different types of stains.
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.
OxiClean™ Bathroom Cleaner can help you thoroughly clean both the toilet bowl and around the base in an effort to keep scum buildup at bay.
Grab some gloves and use a Magic Eraser to go to town on toilet bowl stains. Some users even recommend cutting a piece off and letting it dissolve the bowl to remove that unsightly ring all on its own.
To remove tough stains, add the baking soda and vinegar mix to your toilet and then allow the solution to sit in the bowl for up to 30 minutes. During that time, the chemical reaction between the sodium bicarbonate and vinegar will work to eat away at those stubborn hard water stains.
Make a paste by mixing 1/2 cup of Borax and enough vinegar to form a thick paste. Spread the paste immediately onto the hard water stains in the toilet so they are completely covered by the paste. The Borax will harden quickly so don't add the vinegar until you are ready to apply the paste.