I don't use it that frequently (every few days? Usually when at the pub only), so maybe having the liquid sit in it (which is actually quite sugary as it's natural fruit concentrate rather than "flavour") does something bad.
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I don't use it that frequently (every few days? Usually when at the pub only), so maybe having the liquid sit in it (which is actually quite sugary as it's natural fruit concentrate rather than "flavour") does something bad.