Our expert says:
It sounds a bit mean but since most visiting cats first smell all around the window sill etc before entering a house that isn't theirs, sprinkle pepper on the window sill to put it off. Some cats go nextdoor for freeby meals even though they are well fed at home. As long as the visiting cat does not wear a cat flap activator magnet you could install a cat flap for your cat and then keep the window closed.
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