Where Are The Flies Coming From?

[NancyPickford]

In the last few days, flies have started appearing from somewhere in the kitchen. We took everything apart, investigated every nook and cranny for a breeding site, with no success, so we bleached and cleaned and thought the frost would finish them off. Nope, they're still coming. There are about a dozen a day, horrible things. Not bluebottles.

We live quite rurally, so a dead mouse somewhere is a possibility, but where? And how do I deal with these flies?

We are using Raid to spray them, and obviously keeping all food covered, and DH went out today and poured Jeyes Fluid down all the drains and along the back of the house.

There are no floorboards in the kitchen, it's a concrete floor with laminate flooring on top.

Where are they coming from? I'm at my wits' end.

Plug hole and/or overflow hole?

A bit of fruit or veg hidden?

The dead body someone in your household has hidden away?

Teeny tiny ones? Could be living in the soil in a houseplant

Could they be cluster flies? www.griffinpest.com/blog/winter-fly-problems/

If so they are a real pain OP, I used this stuff and have managed to get rid of them: Pest Expert

They're normal black house flies.

DH just pulled the cooker away from the wall and there is a hole there, which he's currently filling in. Don't know if that's where they're coming from.
@hesaidshesaidwhat - I'll take a look, thanks!