FIP is at least 17 different viruses; most of them are present continually in the environment. Coronavirus mutates readily; that's why the test and vaccine isn't worth diddly. Mutant coronavirus causes SARS in humans. Nasty stuff!

As far as decontamination, washing all bedding in bleach, and using 1% bleach on solid surfaces will kill ANYTHING. They use that at work in the biohazard areas, and they work with some pretty heavy duty biohazards.