To clean the toilet brush, add 1/4 cup of bleach to the freshly cleaned toilet bowl water and submerge the head of the brush.

Bleach only bleaches the limescale ... water - avoid boiling water as it can harm your toilet. Next, use your toilet brush and agitate it inside the toilet bowl a few times to expel some water ...

I clean my toilet regularly with different types of bleach products ... "Black Harpic. Scrub with a brush then leave for as long as you can, then flush. Bleach won't get rid of limescale ...