First spread some bicarbonate of soda on the stain  and then  pour the hydrogen peroxide over it , the two ingredients together will create a reaction generating a sort of foam.

As with the other methods, you will have to leave it to act for a night or half a day, then scrub with the toilet brush and that’s it, the stain will have faded considerably!

Again, similarly to vinegar, lemon and citric acid, this remedy cannot be used on marble and natural stone.

How to remove yellow stains from bathroom fixtures?

Dab some white vinegar with a sponge on the stains to be treated. Leave it to act for a few hours, then rub vigorously.

How to make the bottom of the toilet white again?

If the bottom of the toilet has darkened, pour a pot of very hot water and 2 tablespoons of sodium percarbonate. Leave it to act overnight. You will have a white and sanitized toilet.

How to remove yellow encrustation from the toilet?

Toilet caked yellowness goes away with citric acid. Dissolve 150 g of it in 1 liter of demineralised water, transfer to a spray bottle and spray the solution on the yellow stains. Leave it to act overnight, then rub vigorously and rinse.

Why does the toilet turn yellow?

The toilet turns yellow due to water flowing into the toilet. Especially when there is a leak, the water never stops flowing, which is why the limestone contained in it deposits on the surface of the ceramic.