I sure wish more cat owners had your attitude.
If the talking to the landlord doesn't work I'd contact your local animal control and find out what exactly your right are. Maybe you can put out a humane trap and turn them into animal control where they'll have to be ransomed out.
/oops, you said they WATCH their cats do it? That might not work. I"d bag the poo up and hand ti to them in a brown paper bag and say, "I think you forgot something". Disgusting pigs.




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