Heard a similar solution for getting rid of fruitflies this weekend - pour some white wine vinegar into a glass then wrap the top of the glass with cling film and pierce several times. The fruit flies are attracted to the white wine smell, crawl through the holes in the cling film and then are trapped inside and killed by the vinegar. This is good for flies in the house as the cling film will also prevent flies being spilled everywhere if the glass is accidentally knocked over.
I'm going to try it tomorrow.
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