1 cup (250ml) vinegar
1/2 cup (110g) baking soda
To give your toilet an all-natural clean, start with vinegar. Pour it into the bowl and let it sit for 1 hour. The mild acidity will jump-start the cleaning process and make the next step much easier. To finish the job, dip the toilet brush in the bowl and then sprinkle with the baking soda. Scrub the inside of the bowl until clean, adding more baking soda to the brush as needed.
Safer for septic tanks than many commercial cleaning products