I usually use a Neem oil shampoo for fleas and have had very good results...this is the one I'm using now....
Tropiclean Dog Shampoo - Pet Supplies - Compare Prices, Reviews and Buy at NexTag - Price - Review
I've also read about Dawn dish soap and fleas but I was uncorfortable about using it......I wondered if any soap could do the job just as efectively so a few weeks ago I had one of the boys in the tub and was just about to put the Tropiclean on when I decided to try just a plain shampoo . The only thing in grabbing distance was human Pantene so I went for it.... I suds him up
real good and left it on for 6 minutes ( I wanted to be real sure

) when I brushed him out two dead fleas fell off onto the white towel that I place under him so I can see better.
I also did this with a regular pet shampoo, I think it was Spa from the health food store and found a dead one. I wonder if it may have nothing to do with the shampoo but it may be that fact that as long as the soap is left on long enough they will drown (?)...
I have been using this ceder oil spray for any I may see crawling in their fur. It is fantastic!... I love the fact that it is safe and I don't have to try and grab the flea manually and remove it, I just give it a one quick mist and it is dead in under five seconds!....Everytime I used to try and pick it off it would jump or run and I would lose it but now any I see is a goner! I ordered the two little 4oz. canisters to try it out and loved it so now I'm waiting for the quart....But be forewarned it does have a strong cedar smell.....
ANIMAL HEALTH PRODUCTS