Hands down a 10% bleach solution left to air dry will kill pretty much anything you can throw at it. We only do this sort of heavy duty disenfection on baby racks, quarintine racks, egg tubs, water bowls, when we change animals in a tub and once or so a year on the big girls. Normally on an as needed general cleaning basis we use blue clorahexi to spray out and wipe down tubs. We let it air dry as well before adding substrate back into the container. If blue clorahexi can't get the job done the tub gets scrubbed.