Attic Clean Up - Attic Decontamination - Smell in Attic - Once your attic space has been insp ected and the critters have been identified, it’s time to get them OUT! Dealing with rats in your attic space and other wildlife is not fun! Not to mention how much of a pain the attic clean up process is. Rat urine and feces contaminates your attic and smells horrible and can contaminate your insulation as well. Therefore, attic cleaning and insulation replacement runs hand-in-hand.