are you using mothballs in your vacuum bag? vacuum everyday and also put the mothballs around your steps outside use a generous amount like a whole box.
a night light with a saucer of water under it will attract them and they will drown
Have you tried skin so soft from avon? it works really well
I used it when we were redoing the inside of a house we purchased. We put it on us but would leave the bottle open while we were away until the next weekend and it did the trick. If I had this problem again I would put it on a rag and hang a rag in every room.