If you can get out to a petstore to bath them, yes I prefer you do that as well, I have used 'human' shampoo many time (not frequently) with success. Some are safter than others, a mild shampoo, and sometimes baby shampoos are ok in emergency situations.
Try to find something for 'kitten's'. Things that are for dogs and cats, I try to stay away from.
Like that night with those kittens, I had stinky harsh ferret shampoo, or gental mostly water human shampoo lol. The stores were closed, and they were covered in their own crapulace, waiting till morning was not an option lol.
I have this one pamphlet that I got lately from a rescue group. a print out of some well known place on the web and it said to use antibacterial soap.. handsoap/dish detergent. It sounded kinda funny to me, since then I have had several ppl tell me that its a very bad idea.