Get a quart of muriatic acid ( from a pool store of pool supply isle or a hardware store.) Pour a cup into the bowl water. Use a toilet brush to move that water up under the rim. Let it sit and then move more up there. This will dissolve the mineral deposits which will release the filth.
Put on gloves and get a bowl of white vinegar. Take a handful of toilet paper and soak it in the vinegar, squeeze it out and tuck it under the rim. Repeat until the entire rim is stuffed with vinegar-soaked toilet paper. Let it sit for an hour or so then take a toilet brush and knock all of it out and flush.
Start by pouring a cup of vinegar into the bowl and using a toilet brush to spread it under the rim. Let it sit for a few minutes or a day, giving it time to break down the stains. Then, sprinkle baking soda around the rim and over the vinegar-soaked areas.
Use vinegar or another acidic cleaner to clean calcium buildup from your toilet. 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.
To do this, you can use Lysol® Power Toilet Bowl Cleaner, which both cleans and disinfects your entire toilet and is especially angled to hit your toughest stains directly under the rim.
Apply baking soda to the tarnish and leave for a few hours. You can also use baking soda in combination with vinegar. Try a mild urine scale remover or limescale remover to tackle brown deposits.
If CLR Grease & Oil Remover is left on a surface for too long it begins to dry and can be very difficult to remove.
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). All you have to do is spray it on the desired section of the toilet, wait a few minutes, then scrub it away with a toilet brush.
A: To remove black mold under the toilet rim, scrub the affected area with a mixture of water and bleach or vinegar and baking soda. You can also use a mold-specific cleaner designed for use in toilets.
Use your gloved fingers to apply the toilet cleaner or paste under the entire rim. You need at least a thin layer all the way around. Let it sit for 15 minutes, then scrub vigorously under the rim with your toilet brush.
White vinegar
The mild acid can dissolve limescale and disinfect. All you need to do is pour a generous amount of white vinegar down your toilet bowl, let it soak in overnight, then scrub with a brush. Then flush to rinse, and voilà, your toilet is back to its former whiteness!
Always wear gloves when cleaning with vinegar to protect your skin from the acid. A special tip: Coca Cola – this fizzy drink contains phosphoric acid which also removes limescale and urine scale.
Bottom Line
The main difference between CLR and vinegar is that CLR is stronger and better at removing mineral build ups like limescale. Vinegar is better at cleaning rust. It's also cheaper, versatile and safer than CLR.
When it comes to being good for the environment, CLR has a slight advantage. It's biodegradable and part of the EPA's Safer Choice Program, which recognizes products with safer ingredients. Lime Away works well, but it doesn't have the same environmental certifications.
Apply directly to the stain with a brush, cloth or sponge. After 2 minutes rinse promptly with cold water. Never leave Calcium, Lime and Rust Remover on an area for longer than two minutes. If the stain does not disappear, repeat this process and add more Calcium, Lime and Rust Remover solution as necessary.
The acidic values of vinegar allow it to soften limescale and prepare it for scrubbing clean. Pour undiluted white vinegar into your toilet bowl, making sure you get it up under the rim where limescale often gathers and cover every part of the surface. Leave it for three to four hours and then scrub it with a brush.
Who knew that dishwasher tablets could help keep your toilet sparkling clean? Just drop a dishwasher tablet in toilet bowl and let it sit for 10-15 minutes. Then, use a toilet brush to scrub the bowl and flush it. The tablet will help to break down any stains or buildup in the bowl, leaving it fresh and clean.
Soak a rag or a cloth in vinegar or lemon juice and wrap it around your tap, ensuring all areas are covered. Secure the cloth with an elastic band and leave for an hour. Occasionally squeeze the cloth to release more of the acid onto the tap. Remove the cloth and wipe away the limescale.
Final Verdict. The best overall hard water stain remover is CLR Brilliant Bath Foaming Action Cleaner.