I thought this seemed an excellent idea until I read Richard Bridges' posts and then I had reservations.

I do think you would need to be very careful with a scheme like this because there is always someone who will go too far.

I don't agree with humiliating people although I do think the van load of cleaning materials for people urinating in the streets is a good idea and would work well. I did see an example of this on a TV programme recently and the person coming out with the van was actually a volunteer. He was turning out at all hours of the night.