uke I'm so sorry. That sounds awful.
I have not thought about it before, but i would probably just wash on the hottest cycle twice. STBX used to take the sheets outside and hose them off first, i thought that was
so unless there are alot of solids in there, i would just wash them and dry them on extra hot.
There was a post on Flylady a while back (years) about tummy bugs and having the kids afflicted sleep on a blow up mattress near the batheroom. I don't know how old your kidlet is though.