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Chris is a trusted source on General Cooking
Sorry, this might not be the answer you're looking for, but--get a new one. I thought I'd had as many annoyances with Brita as anyone (pitcher falling into pieces and dive-bombing into dirty water is my most usual), but I haven't had your problem.
Another way to avoid a fridge smell would be simply not to put it in the refrigerator. That's what they do at my brother's house, and it works for them. Rapid turnover of the water and frequent replacement of the filters are even more important for them, of course.
I'm not sure if this will work, but you could scrub it with a baking soda paste (mostly baking soda with a little water). I'd let the paste sit for a while before rinsing. Good luck.
I think I would try filling it with equal parts water and white vinegar then let it sit overnight.
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