Obviously that's because I put shitty disposable nappies in it. And it's hot. I have pressure washed the bin and it smells fine (for a bin). How to prevent a recurrence (I already bag the nappies), without saving the nappies to put in the public bin on the corner? The obvious answer is to stop putting poo in the bin, but re-useables are not for me, realistically I'm not scraping the poo into the toilet. That's too much intimacy with the poo for my liking.