I've had the same problem over and over. The only solution I've found is to use a tube only for one particular flavor. Bottles can switch with a good bath, provided that you do the cap mod rather than use the OEM oring cap business, but those damn tubes hold on to flavor for ever and ever. I just received a 4' length of tubing from the master, so I can switch as much as I want. Bang your head against the wall all day and try a million different tinctures and dances and prayers to rid them of the flavor, or just bite the bullet ($10 shipped for 4' of tubing) and buy a good length and designate bits of tubing to particular use.
