[saiya-jin]

Well, you only need those bacteria to make it rot and I can guarantee you that there are billions (or more likely large numbers of trillions) of various bacteria there, I would expect tens of thousands various subtypes (sorry for incorrect naming, just an average Joe).

Just because they are now in low gravity doesn't mean they will stop eating whatever they can. And without much gravity to hold them down I would expect they can actually spread more easily (imagine one cough or sneeze where droplets just go in straight line till hitting something).

On their skin, behind their nails, in their mouth, in their bowels and so on. Plus on and in everything else. No way getting rid of those

[jacquesm]

Isn't the ISS a high rate of mutation environment for such creatures as well due to the radiation?