Joshyboy, I think your hot water cleaning technique is okay. It doesn't kill everything like the bleach solution or other products mentioned. However, if your animals are healthy and your collection is "closed" then imho you should be fine.
If your animals are being exposed to new animals or you are introducing possibly infected caging or equipment, then you might consider the bleach solution. Bleach is quite inexpensive and a very effective way to clean caging and materials.