...to wash flannels that I use to go over my baby's bottom in with the general household washing?
I always wipe DS's botty with wipes, then go over it with a flannel and water, to remove nasty chemicals, when I change his nappy. I change the flannel every day. DP thinks that we should wash the flannels at 60c, but I think he is being a bit anal ('scuse the pun).
The way I see it, the poo is removed by the wipes, so the flannel is no more dirty than your standard skid-marked undies.