Different people will recommend different things..aka chlorohexidine, and such but I just use somewhere between 5-10% bleach solution (I never measure it exactly, I just make sure it's under 10%) and it works just fine for me. Just make sure you rinse very very thouroughly! The smell of bleach is bothersome for people, just imagine how bothersome it is for your snakes whose sense of smell is much more accute than ours...