Ok the Camelbaks are now sparkly clean! I was able to find a Camelbak cleaning kit at Academy Sports in the biking department. I had to buy the whole kit but all that I really needed was the long wire with the pipecleaner on the end to clean the tube. Anyway that was just what I needed to get the job done. I ran water with baking soda in it through the bag and hose and then scrubbed the whole thing and followed up with several clear water rinses. A quick quality control check showed that the water coming out of the Camelbak now tastes like water, not funk, slime, mildew or whatever else was culturing in that tube. Thanks for the help on this forum!
The mountains are calling and I must go.