I am having a problem with flies in my house. I have a maid that comes over every day and cleans the bathroom and whatever else that needs to be done, but every once in awhile these flies appear and I don't know hwy they are coming around in the house. I also have like packs of mice or whatever animals they are that I have to spray all the time. Are these just things that you can't get rid or what. Please let me know.