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.
Green or brown stains are a sign of lime buildup. It happens because of the evaporation of hard water that leaves behind mineral deposits.
The brown stain is from a large amount of iron in your water.
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 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 and vinegar together in the same mixture. This can create peracetic acid, which may be toxic and can irritate your throat and lungs, eyes and skin. You can, however, alternate spraying hydrogen peroxide and vinegar on a surface. Just make sure to wipe the surface between sprays.
Like bleach, it effectively kills fungi, spores, and yeast. We recommend using hydrogen peroxide because it is a safer, more environment-friendly alternative to bleach products. It's a biodegradable material made of water and oxygen that completely decomposes.
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.
Or perhaps you are seeing some black stains in your toilet bowl or dishwasher? These unsightly stains may be a result of high levels of manganese in your water. Manganese is a natural element that is commonly found in water, soil, and some foods and, at appropriate levels, plays a role in keeping us healthy.
Hard Water Mineral Buildup. If you regularly notice brown water inside your toilet bowl, it could be due to hard water mineral buildup. Hard water contains high levels of minerals like magnesium, calcium, and iron that can build up over time inside your pipes and fixtures.
BKF is the #1 non-bleach Cleanser in the market today. The most significant differences between BKF Cleanser and Comet or Ajax is 1) the absence of bleach AND our use of oxalic acid, 2) the quality of “scrubber” used, and 3) the detergents used.
First, flush the toilet and then pour a quarter of a cup of Borax into it, using your toilet brush to swish it around. Next, add one to two cups of vinegar and let the mixture sit for 20-30 minutes. You should be able to scrub the stains away and flush the toilet to reveal a fresh, and clean bowl.
Hydrogen peroxide, vinegar, and baking soda are green cleaning solutions to wipe out the most common toilet bowl stains.
Steel wool scrub
Since steel wool is such an abrasive product, you can either use it alone or in addition to borax + vinegar +/or baking soda for better results. 0000-grade steel wool is recommended as it's less likely to scratch up the inside of a porcelain toilet.
Considering the fact that melamine foam pads can tackle anything from scruffs on walls to stovetops, it's no surprise that these petite powerhouses can also burn your skin. Make sure always to wear a pair of gloves while using your magic eraser, and never ever use it directly on your skin.
The main disadvantage is the small disinfecting and oxidising ability of hydrogen peroxide at active concentrations (tens of milligrams per litre), which are required for swimming pool disinfection. Another problem is the quick decomposition of hydrogen peroxide in water and the presence of oxygen radicals.
For the health of patients within a hospital or any healthcare building, hydrogen peroxide should be the main choice for use in cleaning.
Hydrogen peroxide is one of the more affordable ways to whiten your teeth as many people have it in their homes.