I bought a new Dakine hydration pack a few weeks ago and the bladder has been all but unusable because it tastes like plastic. The first sip I took burnt my mounth with a chemically/plastic taste and it's barely gotten better despite my best cleaning efforts.
I've tried soaking it in baking soda/water, vinegar/water and scrubbed it out with soap but it's still just terrible.
What are some other tricks to get rid of the taste?