Baby Shampoo or Dawn for Fleas on Kittens

I have had a problem with fleas. I have kittens that are not at the age of weaning as of yet. So I did the Dawn bath, with the kittens, and then simply didn't rinse. I patted them dry. It is warm where they are. This is a good way to get fleas off of kittens. I have also done baby shampoo baths, where I didn't rinse them off. The mama of the kittens didn't seem to mind and it didn't hurt her at all, to take care of them. Just a little tip. These babies remain flea-free almost for about three days.