You don't say if these are indoor only cats...so, I am going to mention a couple of things..first, if you have treated (bathed) the two tamer kitties a couple of times, they should be able to be treated with something more permanent..like the little drop that goes on their shoulder blades (though I think they have to be a certain age for that, maybe six months)- and then you must treat the house, the area they spend most of the time in. Wash the bedding that you can in the washer. Use the flea powder on the carpets and furniture. There is also a foam. You can 'bomb' the house but you and the animals have to leave for awhile (instructions are on the packaging). As to the little untamed one...have you thought about putting him in a sack and at least powdering him? I was also a little more successful with the frontline spray...and I sprayed my hands then rubbed the kittens. You have to have a system in place to kill the fleas AND the larvae (spelling?) too. Something like the eggs hatch days later? Good luck.