Have you read what they are now doing in Cheltenham? If dog dirt is reported they send a warden out (sounds good, but it continues) who sprays a red circle around it and then goes away.
A week later he goes back and if its still there he adds a yellow circle.
Two weeks after it was first reported he goes back and, if its still there, he adds a white circle!
3 times a warden is sent out and the dog mess is still there (is left after the third time to decompose or is picked up) why not just send a warden out to clean it up???