I must state that 99% of the renters we have had rented to have been stellar renters. It just happened that this specific family was very dirty. I am happy to say that we have not have any additional families that are as dirty as this one, nor do they even come close.
What we did to make this house "new and improved."
New countertops in kitchen: Granite
New carpet throughout whole house: Its obvious a new carpet had to be installed
Fresh coat of white paint: It really a major difference