Stir the baking soda into the water.

Add in the castile soap.

Then gradually add in the vinegar a little bit at a time. It will foam and fizz like soda.

Lastly, add in the tea tree oil and lavender essential oil.

Transfer this mixture to an old toilet cleaner squeeze bottle. Give the bottle a shake before using. 

This works to clean the toilet seat and toilet bowl.

For really dirty bowls you can apply straight vinegar or make a solution of 1 cup borax and 1/2 cup fresh lemon juice.