Using without baking soda:

Drain the flush tank, and close the faucet so it doesn’t fill up. Wipe the inside of the flush tank and dry with a cloth, and wipe again with a cloth soaked in vinegar. After 2-6 hours, you can clean the dirt accumulated in the tank.

What does the vinegar do?

1. Breaks down fur.

2. Removes rust from metal pieces.

3. Evaporating by itself, vinegar removes unpleasant odors.

4. Breaks down kidney stones.