fly strips, the sticky kind are great!
there might still be the odd one buzzing about, but the strip suddenly looks full & you'll wonder where they've come from!
(my sadistic streak is coming out now - I quite like seeing them all stuck fast!)
we find they come into the kitchen lots, even when its spotless (which is rare, its usually clean but untidy!) do you have cats or dogs? cos flies love their food.
we see little swarms of flies in certain places in the garden, they kind of hang about particular areas.
If you're putting fly strips in the goat shed, its obvious - but make sure the daft beggers can't reach them!
there does seem to be an explosion in the fly population at the moment.