How can I remove terrible dog odor smell from a recently condemned mobile home?

Me and my friends have been given a piece of land with a Double wide mobile home on it. We got the property free from my friends mom, we just have to clean it up. The house is in terrible condition. My friends crazy ex stepddad left dogs in the house and just dropped dog food on the floor and there are dog droppings everywhere. We already have the house cleaned out we tore the carpets out and everything but the smell is so strong. how can i rid this terrible odor from the house? Also we really dont want to get rid of the house overall because we have no money but we are also concerned that it might be hazardous to our health. we only plan on living here for no more than 2 years to save our money.