The option to use bleach is not as simple as one may think. The Environmental Control and Life Support System (ECLSS, pronounced “eeclyss”) can easily be poisoned by various vapors. At least that is what the ECLSS people told me when I needed something onboard cleaned with alcohol (methyl or ethyl).
The NappyOne
“The option to use bleach is not as simple as one may think.”
Bleach is also corrosive and could damage electronics. The fact is any environment where humans live is teeming with bacteria. You can clean and disinfect to a certain degree but you cannot keep it sterile, nor is there a reason to.