How to get rid of Rat Droppings?

Rat droppings are the serious problem every housewife deals at the attic. Well, there are many techniques to clean up any urine and droppings. One can spray the urine and droppings with a disinfectant or a mixture of bleach but this technique will work for a week, it won't give any permanent solution. So Is it Okay to contact Rodent Control NYC for this problem? Or Should I Follow the steps of exterminating them by using DIY methods only?