[header] How to clean a toilet with coke [title] Use lots of scrubbing. [step] A good old-fashioned toilet brush is your best bet if simple flushing won't remove your stains. The mechanical action of a brush (or a similar item, like an abrasive pad) will further loosen built-up stains and help remove them from the walls of the bowl after you've treated them with coke. 
Be sure to wash your hands after scrubbing and wear gloves if germs make you squeamish. [substeps] For best results, scrub before and after using the coke.