But in order to fully savour some of the true horrors that are public-use toilets in China you should read this article and subsequent comments from Talk Talk China.
For an appetite whetter, this is my favourite so far:
"Without wishing to put people off their lunch, I feel I must share my own “favourite” public defecation experience. Whilst in Carrefour one afternoon, looking to purchase a baguette or two, I wandered into the bakery section of the store and came across a woman holding a plastic bag, the type you put loose produce into before it’s weighed and purchased, under her son, as he proceeded to shit into it. In the store. Next to the bread. And no-one said anything either."