I can offer no defence of the toilets and agree that they are bordering on 3rd world facilities. Extremely embarrassing and the forthcoming refit of all toilets facilities at MAN is not a moment too soon.
However, I will ask that you consider this. The state of an airport is not only determined by how well it is looked after but also by how it is treated by the passengers. And the way I've seen some people treat the facilities when travelling through the airport is absolutely disgraceful. I won't mention specifics but certain passengers from certain airlines are worse than others. They have no regard for other people and treat the place like a dumping ground. So you could spend hours and hours of each day cleaning and maintaining the toilets but they would still become a disgusting mess.