I don't know. I've never had the problem of fleas before. My mother in law uses flea shampoos on her cats and flea collars. (I definitely will never use a flea collar). I will stick to dawn dish soap. We have tons of that. As for flea preventative, what is best to use?

We've never had the issue of fleas with our cats since they were always indoor cats. Never went outside unless it was in a carrier and they went straight into the car for a vet visit. Bailey, our dachshund brought them in. So now we are on the hunt for flea preventative that actually works. (tried some on the cats a week ago and it didn't work).