Recently, for some reason, a couple of yellow-billed cardinals have taken a liking to my car. I thought they were attracted to their reflections in the mirrors, though I later realized it was their reflections in the windows that they noticed more.
The downside of their activities was the all bird poop I had to clean off the side of the cart. So I decided I needed a deterrent. It seems to work. At least I haven’t seen them since!