How do I get the brown stuff off the bottom of my toilet?

Here is how to do this right way:

Pour one liter of undiluted vinegar around the sides of the toilet bowl,
Let it be for about three hours,
Scrub off any leftover stains with white vinegar,
Flush the toilet off to get rid of residue,
Repeat if needed.
Why is there a brown ring in the bottom of my Toilet Bowl?
Now, we have the main culprit for the appearance of the brown stain in bottom of toilet bowl. That ugly ring in your toilet is truly a creation of hard water buildup. Don’t take this for granted – you may be seeing other, complex shapes down there as well.
What causes limescale to turn brown in a toilet bowl?
Limescale (calcium carbonate) appears as a white powdery film at the very beginning. If not taken care of, limescale starts changing its color – going from gray-ish to green and finally – brown. The reason for discoloration is iron or manganese compounds, which make limescale transform to beige or even orange. Toilet Bowl Stain Removal Myths
Why is there black stuff in toilet after flushing?
Why is there Black Stuff in Toilet after Flushing? If you notice black stuff after flushing your toilet it means that either the pipes that supply water to your house have some rust or leaks. The leaks and rust harbor black mold that is then transferred to your toilet tank. At same time black stuff could indicate an issue with the water itself.
What causes black mold on bottom of toilet bowl?
Cracks in the ceramic bowl, tank, and other bathroom fixtures can cause mold. These cracks provide the fungus a conducive environment to stick, grow and flourish. In the bowl, black stains are usually found under the rim, below the waterline or at the base/bottom.
Now, we have the main culprit for the appearance of the brown stain in bottom of toilet bowl. That ugly ring in your toilet is truly a creation of hard water buildup. Don’t take this for granted – you may be seeing other, complex shapes down there as well.
Why does the inside of my toilet have green stains?
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.
How can I get brown stain out of my Toilet Bowl?
Sip a few spoons of baking soda in the loo and pour some Coke into the bowl. This will create a chemical reaction – sprinkles and foam. Just leave this sit for a couple of hours and you will see the bottom of your toilet bowl stain-free.
Limescale (calcium carbonate) appears as a white powdery film at the very beginning. If not taken care of, limescale starts changing its color – going from gray-ish to green and finally – brown. The reason for discoloration is iron or manganese compounds, which make limescale transform to beige or even orange. Toilet Bowl Stain Removal Myths