My guinea pig often spends the morning and evening with her little cage in the balcony since the weather during these times of the day is very pleasant. I recently noticed that there are flies in the balcony. Two flies that just don't seem to leave. I gave her a bath, Cleaned her cage and her mat but they just don't seem to go. Flies can cause serious illnesses. I read in many articles that eucalyptus oil's scent is something that flies hate. Eucalyptus oil is also toxic to guinea pigs upon putting on their skin or if they drink it. Is the scent of it also toxic? What can I do to make sure that no flies show up?