I just inherited a 2017 Four Touring Prius. The previous owner had several large dogs and they were in the car quite often. There is a very strong smell that permeates the car when I turn on the fan. It is not as strong when I only use the AC without the fan. I am just guessing it is related to the dogs; I am not totally sure. Does anyone know how I can totally get rid of this odor? It is so strong I am considering not keeping the car if I cannot get rid of it. The smell: - is very strong and nauseating when I first get in the car - it's a heavy, somewhat floral/syrupy odor - it is overwhelmingly strong when I put on the fan - diminishes a bit with the AC on - will go away mostly if I leave fan off, the AC on, and keep the windows down for about 5 miles of highway driving (very inconvenient!) - is worse when the weather is hot Here are some things we have tried: - took out backseat leather and vacuumed dog hair from beneath seat covers - replaced cabin filter - sprayed Lysol into ventilation system (this worked for about 24 hours, but the odor came back) - had car deep cleaned (although not a thorough detailing) The car was not driven for about four months before I inherited it. It used to "live" in Washington State and now lives in Southern California. I have no idea if that provides clues or not! Any help in solving this would be appreciated!