Rome total war was a great game but no matter how much you built up your cities you were sure to get squalor. Sure you could get public baths to increase the cleanliness of a city but that squalor would still be there! The only way you could actually get rid of it was to make the city rebel and then exterminate the citizens! PLEASE CA fix this!
Maybe you could hire citizens to clean the city which would get rid of squalor for as long as they are working. You would pay them according to how long they would work.