Unwanted flies

Hi.

I live in the seventh floor of a big building and I have some problems with creepy crawlies coming up from the floorboards and from the walls. I want to fumigate the flat without loosing my own life, killing my neighbour below and killing my food.

Any good, SERIOUS ideas about what spray I should buy ? 

Place lemon slices next to the walls at a distance of every two feet.

I saw the thread title and thought, "So what?  Delete them..."

Too much time on the computer these days...

Anyway, I don't know what your landlord's policies are, but here, pest control is part of the deal.  Perhaps you can speak to the owner of the building to get this remedied?

Flies are short lived and will all be dead within a few week's. Your task is to find the source and remove that otherwise they'll keep coming back.

If it's fruit flies there is a really nifty trap you can make (although the question of whether it attracts more than disposes of is another matter). Take an empty jar and put a little jelly or something along those lines in the bottom. Then make a funnel out of a piece of paper and place the narrow end into the jar (make sure the hole is small. Flies get in but not out.