Originally Posted by vroooom ptssssh
Dont store them with the lid on either once you get it smelling....of a flask again? lol
Copy that, the same reslut if you leave a fridge unplugged and the door shut,it goes all fusty.
the smell is a build up of Bacteria in the flask, clean this using a neutralising cleaner then never store with the lid on.
I wouldnt advise bleach at all.