They can get cloudy at lower temps . Bring them to 25-30°C and if they become clear again, they're okay. Polysorbates are very stable: Tween 60 is visually stable for years but might get cloudy at higher temps when getting old whilst polysorbate 80 starts smelling rancid before you see any degradation. I found some long forgotten bottles in our cellar which were over 20 years old and they only showed minor visual signs of ageing. Smell wasn't okay but still far from rancid.
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