White vinegar really lends itself to countless uses when it comes to cleaning.
For example, for dark stains in the toilet, simply pour liberally directly onto the stains (or at the bottom, if the problem is below the water level) and leave it on for about 20-30 minutes. The vinegar will thus act by weakening the stain, allowing you to clean by scrubbing with a toothbrush or sponge. In addition to cleaning, vinegar is an excellent ally for sanitizing, so using this method periodically will also help to prevent stains from reappearing.
The application for shower glass is very similar. In this case it is advisable to create a mixture of 250 ml of water, 2 tablespoons of vinegar and 2 tablespoons of baking soda.
The ideal procedure involves the compound being inserted into a spray bottle, sprayed onto the shower glass, and left to act, again for about 20 minutes. You can then proceed by scrubbing with a sponge, rinsing with water, and patting dry with a paper towel.
The same solution but without baking soda can also be used for cleaning the tiles, both inside and outside the shower. For tiles, the dosages are slightly different, as the ratio should be 2/3 vinegar to 1/3 water. Here you can also spray the solution directly on the tiles, leave it on and then remove with a damp cloth, rubbing if there are stains or small molds.
