Renault Clio 1.6 RXE Auto - foul smell whenever aircon is activated

There is a smell of blocked drains whenever I run air-conditioner. Car is about six years old. I suppose bad odour is due to some ex-condensation vapour with organic muck, trapped in a pool somewhere but not even mentioned in my Haynes manual. Can u help with its location and removal - avoiding bothering Renault with their expensive diagnostic?

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Jim Gregory
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