the bottle santizer stuff doesnt do anything in the way of cleaing: children should just wash their hands with running water and soap after handling the chickens if they are younger then three years old, or immune deficient... if they suck their thumbs or pacifiers, its a no go for inside with the birds , or at leat, w/o the pacifier, and give the thumb sucker something to hold on to rather then putting finger in mouth after handling chickens...
in my personal opinion of running petting zoos, if the kids are not animal wise, or have not been around animals, its always a better option to take a calm chicken out of the coop and let them handle it while it is in your arms. show them the feathers, the wing span, how the feet are, let them touch the toes, find the ear hole, look at the beak, and then and only then, take them one at a time to look at the chickens inside, and if u give treats, let the child give out the treats...IMO