Barbie, I'm creating a separate thread in the chance you might see this. I originally posted it on the Wednesday morning thread, but my guess is you don't go back that far to read things. So here's what I posted ...
Barbie, I'm not sure why you're having such a hard time getting rid of the fleas.
One thought is that there are critters with fleas that continue to frequent your yard. As cute as they are, they're also carriers of all sorts of stuff. If you want to permanently get rid of the fleas you need to remove anything that could remotely provide them with a way to get into your house. And to be blunt, quit feeding them.
As expensive as Advantix or Frontline is, they're effective. I use it on the dogs, but only every other month and we have absolutely no problem with fleas, and they're outside on our grass all the time. And I've never, ever used anything on my cats and they've never had fleas.
Maybe it's time to bite the bullet and take your kitties to the vet to get them freed from the fleas. Then bomb the house. Get some Borax and put it on your carpet and leave it for 24 hours. That means the kitties stay at the vet until all of this is done.
For whatever reason, you're in a house that simply isn't going to be easy to get rid of them. I think that you'll be dealing with them forever if you don't use drastic measures.
Laura