I also use boric acid, it is found under such names as Roach Prof or roach away. It is great for killing fleas, I just sprinkle on the carpets like carpet powder and work it in with a stiff broom. I don't vacuum for a few days to let it work down into the pad. You can put it under chair cushions or other places fleas get. If you can't find it Borax has boric acid in it. It works by drying up the insects so it isn't harmful to pets or humans. We bought a house that was loaded with roaches and I just poured containers of it behind the fridge and stove, under cabinets and anywhere else I could get it. This was after professional treatment and it works well, never had any more problems. I would be scared of the bombs because of breathing it and it getting in everything and it doesn't kill the eggs so in a little while you would be back where you started.