Removing old Airplay Device from list

I have a Samsung TV with Airplay that I set up and now it shows on all my devices (Mac, iPhone, and iPad). The problem is I replaced this Samsung TV with a new exact model, and now both devices show up on my Airplay cast list, so its a nuisance to guess which one to select as one does not exist in my household at all anymore. Neither is the old Samsung TV still connected to my router because I already did a factory reset of the router. What should I do to remove the old Samsung TV off my Airplay list, so there is only the latest one there?

Thank you!