Have you seen the brushes? They're made for the purpose. You can clean the inside of the drink tube as thoroughly as you clean anything with a brush. Your teeth... your chainrings...
And like I said before, HEED is notorious for leaving traces of flavor. I'm surprised you haven't noticed it in your water bottles. I sure do in mine. But I like the flavor, so I don't mind the traces (and anyway, it's usually more HEED that's going in there, anyway).




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