How can I sanitize bag-in-box soda fountain syrup hoses?
Those pop/ concentrate dispensers are pretty much self contained and if you can keep the lines clean and free of the sticky syrup on the outsides you’ve do your job. If the fittings are extremely bad you can soak them in hot soapy water til the syrup comes off easily then rinse in cleans water. If you are really concerned about the lines interior, you might try running a club soda through the system until it runs clear. It may be possible the lines may need to be replaced and a service technician may have to do that type of service. Call your representative and have an inspection done once you clean the outside lines, fittings, and towers from old syrup and debris.