there are plenty of things that would euthanize a frog that i would not use for cleaning. It may evaporate faster but im not going to give it the chance to evaporate. A bathtub and a drinking cup do perfect for rinsing. I would rinse as well when using alcohol as i would when using bleach. Also bleach is cheaper and more effective, so i see no need to use alcohol. And most alcohol you buy in stores is not pure alcohol. Usually it is +-50%. You can get a better alcohol in walmart "isopropryl" iso for short. It comes in a clear bottle with a red label and its something like 90%. Not sure exactly the percent but i know its pretty strong. Still not as effective as bleach when it comes to cleaning, disinfecting, and sterilizing, but is better than some rubbing alcohol you find in other places. Either will kill your frog, the thing is that bleach is more effective at killing germs. I would take the same precautions when rinsing with both of them but id definitely rather remove more germs so bleach is the best way to go.