You may be thinking that those brown stains on the bottom of the toilet bowl are feces but more often than not the brown stains are from water that has too many minerals (iron, magnesium, calcium, etc). Otherwise known as hard water stains which are less gross than the alternative but still an ugly sight to see.
You might notice the staining in your toilet bowl takes on an orange, pink, or brown tint. This is a result of the calcium carbonate mixing with an iron or manganese compound. This can happen around your taps too, but is more common in the toilet bowl.
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.
The carbonic acid that is in coke is what helps to clean toilet stains. Picture the acidity slowly working its way through the stains, melting them away. It can take a while depending on how stubborn the stain is which is why it's vital to have a suitable cleaning method depending on how bad the toilet condition is.
Sprinkle your baking soda (it doesn't need to be an exact amount, just coat the bowl) around the bowl and watch as that chemical reaction sizzles. Swish that solution around using the toilet brush and then let it sit for about 15 minutes. If the stains are still visible use the wet pumice stone and flush.
Vinegar is safe and milder than caustic cleaners designed for the toilet, and those commercial cleaning agents can eat away the good bacteria in your septic system. 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.
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.
Simply sprinkle baking soda on the stains and scrub with a brush. Use bleach: Bleach is a powerful cleaning agent that can quickly remove stains. However, it should be used sparingly as it can damage the porcelain on toilet bowls. Apply bleach to the stains and let it sit for several minutes before rinsing away.
Cleaning your toilet tank is pretty quick and easy with vinegar and baking soda. You only need to do it once or twice a year, and it can help get rid of bacteria, mold, and mineral deposits to keep you and your family healthy.
The best way to clean toilet stains from tough mineral buildup is with lemon juice or any source of citric acid. Spray on the lemon juice and leave it overnight. Then spay on another light layer and wait a few minutes before scrubbing your toilet. Flush to rinse away the stain.
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.
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.
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.