Rosalie B. wrote:
I also thought about putting fly paper or a cayenne pepper paste on the
deck where they sit.

I don't think birds taste "pepper" like people do. The loops of wire
are what I saw used on buildings in Europe, along with short wires
sticking up at about a 45 to 90 degree angle vertically, they seemed to
work OK (they seemed to not catch your hand when running it along the
surface, not that any of this will help.) Dunno about fly paper.