Quote:
Originally Posted by Niamh.
Or check that you don't have some old fruit or veg rotting away somewhere sneaky 
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We had a massive problem with tiny flies at one point for over a month, could NOT get rid of them, no matter how often I removed and cleaned the bins... couldn't find a source...
...eventually discovered with it was. A banana had fallen down the back of the microwave and had been there for months

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