After an infestation, your attic will likely need help to get back to a clean healthy space. Bats, raccoons, squirrels and other creatures can create huge problems and damages in your attic.
All of them create waste. This means urine and feces will have built up in your insulation, walls and other surfaces. Many of them will nest, so nesting materials can be found everywhere in the attic including torn and shredded insulation. There can also be a strong odor finding its way into your home from the attic.