Clean without chemicals
If you want to clean the water container and the toilet at the same time, pour half a box of baking soda into the container once a month, leave it to work overnight and then flush the toilet several times in the morning. If, after all your attempts, you do not see the toilet bowl as bright as it once was, rinse it thoroughly with vinegar using a PowerSCRUB scrubbing cloth and rinse with clean, cold water. This will remove any residual deposits.
You can also bring back the shine of a completely faded and worn surface with a special home-made solution. Mix half a glass of vinegar, half a glass of ammonia and half a glass of borax with three and a half liters of warm water. Then rub the toilet with this mixture and rinse it thoroughly with cold water.