The answer to 'how to clean toilet' is to clean the toilet regularly to maintain hygiene and prevent buildup. This typically involves scrubbing the inside of the bowl with a toilet brush and toilet cleaner, wiping down the exterior surfaces with a disinfecting cleaner, and flushing to rinse away any residue.
For best results, clean the toilet at least once a week. Pay special attention to the rim and under the rim where grime and bacteria can accumulate. Use a toilet brush with stiff bristles to scrub the bowl, and apply a toilet cleaner that contains disinfecting agents to kill germs. Wipe down the exterior tank, lid, and base with a disinfecting all-purpose cleaner. Finally, flush the toilet to rinse everything away.