Fill a spray bottle with 1/2 cup of white vinegar and spray around your toilet bowl then sprinkle baking soda. It'll bubble up, don't be scared.It's perfectly normal for the baking soda to react when they come in contact with acid (vinegar, lemon). You can spray more vinegar of you prefer then leave it until bubbles subside and scrub your toilet.
For all around toilet cleaner,mix the following ingredients.
1/2 cup hot water
1 Tbsp baking soda
1tsp Borax (if available)
1/2 Cup white vinegar
few drops of dish washing liquid
*mix baking soda to the hot water, add borax, vinegar and dishwashing liquid. Stir and transfer to a spray bottle.
Spray around the toilet and wipe clean with cleaning paper. And, VOILA!
This homemade cleaning product will leave your toilet smelling fresh and clean.
This is one of my favorite cleaning agent at home. I even use it in cleaning my kitchen.