If you have never had babies in it before, than soap will work fine. If you have raised chicks in it before, I would use a bleach/water solution to get all the bacterias and diseases off the surfaces.
Lol!!! You're very shouty!!!! My current brooder is an empty aquarium. I only ever clean aquariums out using very hot water. With the chicks in, I'm not washing it, just changing the paper towels once a day. I'm going to move them into my 'small' degu cage, once I've washed it and the extras have arrived. I'm washing that in bleach and I've leave it to stand for a couple of days. Not sure if I've helped, but it's what I do!!!!
