Weird, I have the same problem! They are definitely little nats. I live in CA and like you my car is usually garaged. Gee-Es 300 has a good point though, some of the products I use do have a sweet smell to them. It seems that it is the worst just after a wash, but I have also noticed it when the car was dirty. I know this is gross, but sometimes its a fight to get into my car without letting them in! Ew!