Green or brown stains in the toilet usually indicate lime buildup. Lime scale forms as hard water evaporates and leaves a mineral buildup behind. As it dries, it picks up any dirt particles along with it, and slowly the stain builds, layer by layer, on the inside of the toilet bowl.
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.
If there are brown stains, it is probably from iron in your water. If you discover a thick, slimy mess, it is likely from iron bacteria growing in your toilet tank. Iron bacteria is a bacteria that fixes to iron particles in the water.
Calcium buildup creates a white or rust-colored rim around the toilet water line and leaves hard water stains in toilet bowls.
Pouring acidic cleaners down the toilet can help you prevent hard water stains and mineral deposits. Some people recommend lemon juice, but the most reliable and affordable product to use is white vinegar. Each month, pour a cup of white vinegar into the toilet tank. Leave it for 30 minutes before flushing it.
Borax is a great cleaning product that, when combined with vinegar, can successfully eliminate hard water and mineral deposits. You can use this combination in your toilet and most other plumbing fixtures, too. Here's what you need to do: Grab the Borax and pour ¼ cup into your toilet bowl.
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.
Vinegar is a great toilet cleaning solution. Not only is it free of chemicals and naturally antibacterial, it's also an acid, so it will remove minor lime and calcium deposits. All you need to do is pour a couple cups of vinegar in your tank and let it sit for an hour or so, then scrub and flush to rinse.
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. Simply spray on the affected area, wait a minute or two and brush it away with a regular toilet brush.
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. It's a good idea to wear gloves when using this as a toilet cleaner and to have eye protection.
Try this: Swish a cup of vinegar around in the toilet bowl using a toilet brush, then add a cup of baking soda, followed by an additional cup of vinegar. Let the fizzing solution sit for 10 minutes. Use a toilet brush to scrub stains. Let mixture sit for a few more minutes and then flush.
Because water deposits build up under a toilet's rim, it can take only 24-48 hours for colonies to start breeding. As it grows, you will see what looks like black debris or rings inside the bowl. This can cause respiratory problems for people as the mold and mildew release tiny spores into the air.
You can use straight or a diluted vinegar cleaning solution for the bathroom to clean bacteria, especially around the toilet. 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.
Solution 3: Using WD-40 to remove limescale
Yes, it's that simple. The best part about using a cleaning solution like WD-40 is that its specially engineered formula works its way under the build-up in no time, making the cleaning process easier and more convenient.
Apply vinegar or lemon juice directly onto a cloth and scrub the limescale until it comes away. Alternatively, mix one part lemon juice or vinegar to four parts water. Put the solution in a spray bottle and spritz it onto tiles and plugholes. Leave this to soak for up to an hour for stubborn scale deposits.
For extra-stubborn clogs, you can let the fizz mixture sit overnight or combine this method with plunging. If your toilet remains clogged or continues to get clogged, this may be an indication of plumbing problems such as mineral buildup or pressure issues.
Sprinkle 1 cup of baking soda onto the stain, and then pour another cup of vinegar over the baking soda. Watch the acid vs. base fizz up and let it sit for 15 minutes. Scrub the mixture into stains with a toilet brush.
"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. If you are aiming to remove tough stains from the tank, I also recommend white vinegar diluted with water."