Keep us posted on how these tips work. I had almost decided to take my Polar bottle back to REI and return it, but now it's packed and on its way to Norway. Of course, I can still return it later if nobody finds a way to get it stink-free. I was really grossed out by the smell when I first unwrapped and opened the bottle. I mean, when it smells that plastic-y it must be giving off particles, and plastics are often made of some seriously dangerous stuff. I don't want that stuff in my drinks!