Firstly, where did you hear there was a recall with food from Science Diet, - I assume you are talking about Hills Science Diet, as they were not affected.
All animals take to anaesthetics(sorry about spelling), in a different way - I gave mine half a sedative each once because of the fire works,they were in such a terrible state I thought I was going to have to call the vet. I am sure he will be OK by the time you read this.
Dont think the human shampoo will hurt him, my friend uses washing up liquid on her animals and they have no ill effects, whereas I spend a fortune on the stuff !