To properly clean and care for a toilet:
Wash it with mild, soapy water, rinse thoroughly with clear water, and dry with a soft cloth.
If you find there are stubborn stains and build-up, any standard toilet bowl cleaner and a stiff brush can be used.
A wet pumice stone can also be used when necessary.
Please note:
Do not use in-tank cleaners. These products can seriously damage fittings in the tank. This damage can cause leakage and property damage.