I can highly recommend flea traps. https://www.google.co.uk/search?q=flea+trap&sugexp=chrome,mod=6&sourceid=chrome&ie=UTF-8 There are different ones to get. I just use a simple touch LED light (battery, not plugged in) suspended over a low rimmed plate of water. When we've just had an outbreak, it works so well! Also, giving the cats the flea injection from the vet, using Advocate as well, plus regular spraying/vacuuming, does the trick nicely.