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.
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.
It is quite common for minerals such as calcium and lime, along with debris particles such as rust to build up in the rim feed and jet holes of the toilet bowl. Over time, these deposits restrict and block water from flowing into the toilet bowl which will cause a weak or incomplete flush.
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.
Two of the most effective substances are lemon juice and ordinary vinegar. Lemon juice is usually the best (and will also leave a lovely smell behind). Stronger pickling vinegar and lime juice are both even more acidic and can be used for really stubborn deposits.
How to Remove Calcium Buildup. White vinegar, baking soda and even a lemon can be used to get rid of pesky calcium stains. Many homemakers already use vinegar to help clean difficult areas. It's also helpful when addressing hard water stains or calcium buildup.
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.
WD 40 is great for cleaning out keyboards or loosening bike chains – but did you also know it is really good at removing limescale from your toilet? While it can be put to a number of helpful uses around the home, WD 40 is particularly good at softening rust and limescale deposits in the toilet (and bathroom).
Pour a cup of vinegar into the bowl, then mix it around with a toilet brush. Add a cup of baking soda to the coated areas and immediately follow up by adding another cup of vinegar. Wait about 10 minutes to allow the baking soda and vinegar to interact, creating that effective fizzing action.
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.
"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."
Vinegar and baking soda produce that oh-so-familiar chemical reaction that powers through buildup and loosens tough stains. While it might seem like it's chewing its way through grime, it's not powerful enough to damage the porcelain finish of the toilet bowl.
For a more heavy-duty approach, you can pour an entire bottle of white vinegar over and around the bowl, remembering to cover all of it. Then, leave the vinegar to work for a few hours or overnight. Use your toilet brush to scrub any leftover limescale deposits away the next day.
Pour a cup of Dawn liquid dish detergent into the toilet bowl and let it sit for 15 minutes. After 15 minutes, pour a bucket of hot water from waist height into the toilet bowl to clear it out. This tip comes from Merry Maids: Mix 3 drops of Dawn in 1 gallon of water and fill a spray bottle with the solution.
Sinks, Tubs, Porcelain Toilets, and Ceramic Tile
A way to safely and effectively clean these surfaces is to grab mild soap, sponges, towels, white vinegar, and baking soda. In a bowl, combine hot water with a couple of drops of mild soap, and using a sponge or rag, clean the surface.
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.
For really tough hard water stains, try scrubbing with some hydrogen peroxide. Yep, the same stuff you have in your first aid kit. Hydrogen peroxide plus some elbow grease should banish even the most stubborn of hard water spots from your metal fixtures.
Calcium buildup can be removed from coffee makers and coffee pots using everyday household items such as vinegar, lemon juice, baking soda, and hydrogen peroxide. Mix them with water, let the solution sit, or run a few cycles through your coffee maker to dissolve calcium in 20 minutes or less.
After two or three days in the vinegar, the shell should be completely broken down.
Hydrochloric acid can be used to dissolve calcium carbonate and iron sulfide scales.
As previously mentioned, baking soda does a bang-up job at dissolving calcium deposits left behind from hard water, but this pantry staple doesn't act alone. By introducing an acid (i.e., white vinegar), a chemical reaction takes place that may be short-lived, but highly effective.