Always leave it to act for a whole night  or half a day, then  rub  with the help of the brush and you will start to see results!

Rinse well and that’s it!

Citric acid

In case of more stubborn yellow stains , you can also opt for citric acid .

This element, as well as the previous ones, are used  to wash laundry  or to  make dishes and glasses shine in the dishwasher.

First, take  150 grams of citric acid  and dissolve it in  1 liter of hot water.  Pour everything into a spray container using a funnel.

NB  I remind you that the following remedy cannot be used if you have marble or natural stone ceramics.

Lemon and vinegar

Have you ever tried to remove yellow stains in the toilet with lemon and vinegar ?

All you have to do, similarly to what is described for citric acid, is  fill a spray container with white vinegar  or wine vinegar and the juice of 2 lemons . 

Spray the mixture obtained on the yellow stain  and leave it to act overnight. The following morning, spray a little mixture again and  scrub with the brush , then rinse.