If you'd like a gentler alternative to bleach, toilet scrub is definitely worth a try. Use it to clean and disinfect the loo - it works with a mix of sodium, minerals and fine pumice.
Whenever you need to clean your toilet, just sprinkle a tablespoon or two in and around the bowl. Use your toilet brush to scrub it clean and flush the loo when done. Each one comes in a 500g box and is handmade in Devon.
Claranol Clear Soap, Pumice Powder, Lemon Oil, Lavender Oil.