[header] How to clean a carboy [title] Combine warm water and detergent. [step] In order to clean a carboy, you should pour about two tablespoons (or slightly more) of cleaner into the bottom of the carboy. Oxiclean and powdered brewing wash (pbw) are both excellent products for cleaning carboys. 
Then, fill the carboy with warm water. [substeps] If you are using a plastic carboy, you should dissolve your cleaner in warm water before pouring it into the bottle.