Getting rid of fruit flies fast is beating me

the supermarket traps only catch the ones flying about. you have to find where they're breeding, and it's nearly always something you haven't spotted: a potato gone soft at the bottom of the bag, the recycling with an unrinsed wine bottle in it, the gunk in the sink drain. clear that out, pour a kettle of boiling water down the drain, then put out a jar of cider vinegar with a drop of washing up liquid and cling film with holes poked in. give it two or three days.