I know I know!!! there are several of these threads, all with good info, but I need a little more specific info. Ive tried the syringe and flushing my cartos with hot water after being boiled for 5-10 mins, but they all still have a residule smell of the juice that was in them... Im afraid that the smell means that I didnt get them totally cleaned out and will ruin the flavor of whatever flavor juice I refill with. None of these cartos have ever been refilled, just the fill they had when bought. What can I do to make sure ALL of the juice has been flushed out of them? Does alcohol really work? Lemon juice? More water? Different method???