Thanks for all your comments. I ended up rewashing this morning at 50 degrees. I had in fact soaked the poo vest in water and stain remover before the first wash, so perhaps I was being a bit over zealous.
Lots of people have suggested drying in sunshine or tumble drying but I live in flat and don't have any outside space so can't dry on on a line, and I also don't have a tumble dryer.
I am usually very conscious about use of resources. Before we had dd we used one of those eco balls and therefore did not use soap at all, and washed at 30 degrees. But since we had dd we use washing liquid and washed our clothes hotter and dd's even hotter. Now that our resident microbiologist SeraOfeliaFalfurrias has confirmed that it is effective to wash at 40, I will start doing that, and as Postchildrenpregranny points out, clothes should last longer if they are not washed so hot.
I should also point out to greygardens and stinkersmum that dp didn't turn it down after the wash started, but before. I don't know why he decided to do this but I should have checked the temperature before switching it on but I was so knackered.
ThumbWitchesAbroad it wasn't all of her clothes, but a wash made up solely of her clothes. I was waiting up so that I could hang them out before going to bed, so that they didn't fester in the washing machine all night, and because of the fire risk.