Plastic taste in my backpack water bladder I've seen various suggestions as to how to remove the nasty plastic taste but it still seems to be the overriding taste.  I've tried bleach, vinegar, lemon juice, water purification tablets, bicarb.  I'm almost at the point of giving up and assuming that I'm ingesting carcinogenic chemicals. It isn't branded like camel-back etc.

If anyone has any other suggestions I'm all ears.
Denture cleaning tablets - they leave a nice minty taste as well.  Locally we have a brand called Steradent (UK &amp; Aus only by the looks of it) that I use to clean out bidons every once in a while to get rid of either stale or detergent tastes.