First, don’t wait to have these issues resolved. The longer you wait the more damage they can do.
Next, you should have the problem handled professionally. There are countless “home remedies” and products that can be purchased. More than likely someone somewhere had success with them. However, generally speaking, people spend as much as 4 times what they should by trying different “solutions” that ultimately fail.
It is much easier and cost-efficient to just hire a Wildlife Removal company from the start.