My new Polar Ice bottles were so stinky on their first ride (even after a thorough cleaning with lemon AND in the dishwasher) that I left them in their cages and drank bottled water for 50 miles. When I got back home, I called the company and they immediately offered to replace them, but suggested that I first try cleaning them with denture-cleaning tablets. This seems to have worked. I haven't yet taken a long enough ride for the sun to really heat the bottles up and let the bad taste rock-out, but I haven't had an unpleasant taste on any of my commutes so far. Stay tuned...