Pour a half-cup of hydrogen peroxide into the toilet and let it sit for 30 minutes. Use your toilet brush to scrub the stains. Add a sprinkle of baking soda and scrub again if the stains persist. Turn on the water and flush away stains and germs.
Citric acid
More importantly, it's probably even more effective than vinegar for getting rid of that brown stain in the toilet. 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.
To clean calcium buildup out of your toilet, use vinegar or another acidic cleaner. The acid will break down the mineral deposits so you can brush them away. Be sure to take the necessary safety precautions when working with cleaners. Wear gloves and eyewear and open windows for ventilation.
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.
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.
Vinegar is a natural acid that can dissolve calcium deposits. You can pour vinegar into the toilet bowl and let it sit for a few hours before scrubbing with a toilet brush.
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.
Pour one cup of baking soda into the clogged toilet, and then chase it with the hot water/vinegar mixture. Leave the volcano mix to do its job, checking in about 30 minutes. In most cases the clog will have come apart, and a simple flush with send it all down the drain. Plus your toilet bowl will be cleaner!
Let It Sit For 12 Hours
Leave the vinegar and water mixture in the toilet tank for 12 hours without flushing the toilet. This is why this cleaning process is best done overnight, as you are less likely to need the bathroom throughout the night than during the day.
Another popular method to remove limescale from your toilet is to use vinegar and baking soda. Pour about one cup of white vinegar into the toilet bowl, followed by about one cup of baking soda, then let it rest for around 10 minutes.
Use Vinegar & Baking Soda
White vinegar is a natural solution that can be utilized to dissolve calcium buildup. Sitting overnight, you will be able to remove lime buildup from the drain while avoiding the harsh chemicals in traditional drain cleaners.
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.
To safely and inexpensively clean your toilet bowls, pour a generous glug of vinegar, followed by a heavy sprinkling of baking soda, into the bowl. While the mixture is bubbling up, scrub the bowl (get under the rim, too). Let it soak for 30 minutes and flush. That's it.
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.
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.
Don't mix hydrogen peroxide with vinegar
Hydrogen peroxide and vinegar can be used on the same surface as long as it dries in between applications but they should never be mixed. When the two are mixed, it creates peracetic acid, which can harm the skin, eyes, throat, nose and lungs.
If you take a plastic bottle, put a few pebbles or rocks in it, fill it with water, and then place it in the back of your toilet, you can save up to 10 gallons of water per day. By placing the bottle in the toilet tank, less water is needed to fill the tank and therefore less water is being flushed.
"The biggest don't when it comes to toilet tanks is bleach — do not use bleach or products containing bleach inside the tank, as it can corrode the internal parts of your toilet," says Patty Stoffelen, a bath fixtures merchant for The Home Depot to Martha Stewart.