Put vinegar in the toilet tank: you will solve a big problem

Not just bathrooms

It is also possible to clean the toilet tank and not just the toilet itself. Without flushing, pour white vinegar into the tank and let it sit overnight. This will remove  limescale and rust from the walls. The next day, it will be possible to flush the toilet and clean the walls of the toilet with vinegar to remove possible scale from the cistern tank.